0231_0312_2301

Counting sequence:
1, 1, 2, 6, 21, 76, 275, 991, 3563, 12800, 45976, 165141, 593184, 2130737, 7653715, 27492557, 98754742, 354732286, 1274217137, 4577055240, 16441024023, 59057026159, 212135955587, 762003551500, 2737156984928, 9832012391033, 35317107564316, 126860914845885, 455691103417275, 1636866500495693, 5879710883868466, 21120231898821878, 75864987968004829, 272511041874813124, 978874048922485595, 3516167260826368911, 12630258427748180379, 45368555053951768360, 162966244868072975000, 585383354943049283629, 2102727914739562531256, 7553109677768586305897, 27131168709227627594227, 97456590322681280414541, 350069217405021930641310, 1257467109908148975024158, 4516888243479328881632953, 16224901027886169379474688, 58280701043407695492820447, 209347354925195971767349375, 751986750837708046835077619, 2701176108183989512246057236, 9702767182129096913210993088, 34852851950439677322540328753, 125193284171198487406465408436, 449700885995148367085255657653, 1615349323277405743116855425723, 5802420047357709452776428338573, 20842599133708731871327530450490, 74867716418823942201305658494838, 268928789821812176211985260209349, 966006410432472860993944235190140, 3469946024056901243700923414390563, 12464229305142867692777409924146303, 44772169680479923872475829582874187, 160823997121955164085623890590770576, 577688287944623828664104060621543000, 2075086827840269746509489213628356741, 7453821434387392992777453971084354256, 26774520097339094874866031241006547233, 96175489680446426389901388565523511251, 345467436265754512157860095054571522765, 1240937269116893450546484669333560729414, 4457512182707400717301827405008776132862, 16011619082989474104440571145743585456001, 57514581037675968766925967253257878793720, 206595411419304417007332998222779696483239, 742101624482881311113173835052516229006799, 2665668212458044050291832592852354450956643, 9575220946134957695038228421034949697426780, 34394699137278584583023110523860885892132320, 123547575079343606683118296177347026281695529, 443789412056295740840215951905222251251645388, 1594114996808232117384125991353194292045558829, 5726145225669674846044398921710122453256248827, 20568615947475470239236714600167903715737763277, 73883554349647895703708601480564379434514581250, 265393627713067810970279086594224049229187213238, 953307921508219895541921536837227010130590257517, 3424332381457453573433363252611641126741637904180, 12300382692872617096964137186847237333206990349035, 44183623999351556711954563000701966597800863039407, 158709909964611194574938295148722505041941845019643, 570094375267738690343940086061015251421221214017336, 2047809092604127777952982062362767177779760775544536, 7355838369362438711685086957842533913227006178174493, 26422559755009652536573303245316456776491775774173800, 94911229549972762011792821324773741710628991236989529, 340926147133784087017710410746018696585847947958506739, 1224624718809366135382330985195764063860140753755370829, 4398916640824307408132160178400709482559194464573209006

Generating function in Maple syntax:
-(4*x^3-7*x^2+5*x-1)/(2*x^4-9*x^3+11*x^2-6*x+1)

Generating function in latex syntax:
-\frac{4 x^{3}-7 x^{2}+5 x -1}{2 x^{4}-9 x^{3}+11 x^{2}-6 x +1}

Generating function in sympy syntax:
(-4*x**3 + 7*x**2 - 5*x + 1)/(2*x**4 - 9*x**3 + 11*x**2 - 6*x + 1)

Implicit equation for the generating function in Maple syntax:
(2*x^4-9*x^3+11*x^2-6*x+1)*F(x)+4*x^3-7*x^2+5*x-1 = 0

Implicit equation for the generating function in latex syntax:
\left(2 x^{4}-9 x^{3}+11 x^{2}-6 x +1\right) F \! \left(x \right)+4 x^{3}-7 x^{2}+5 x -1 = 0

Explicit closed form in Maple syntax:
54/1423*Sum(_alpha^(-n+2),_alpha = RootOf(2*_Z^4-9*_Z^3+11*_Z^2-6*_Z+1))+111/1423*Sum(_alpha^(-n+1),_alpha = RootOf(2*_Z^4-9*_Z^3+11*_Z^2-6*_Z+1))+76/1423*Sum(_alpha^(-n),_alpha = RootOf(2*_Z^4-9*_Z^3+11*_Z^2-6*_Z+1))+20/1423*Sum(_alpha^(-n-1),_alpha = RootOf(2*_Z^4-9*_Z^3+11*_Z^2-6*_Z+1))

Explicit closed form in latex syntax:
\frac{54 \left(\munderset{\underline{\hspace{1.25 ex}}\alpha =\mathit{RootOf}\! \left(2 \textit{\_Z}^{4}-9 \textit{\_Z}^{3}+11 \textit{\_Z}^{2}-6 \textit{\_Z} +1\right)}{\textcolor{gray}{\sum}}\! \underline{\hspace{1.25 ex}}\alpha^{-n +2}\right)}{1423}+\frac{111 \left(\munderset{\underline{\hspace{1.25 ex}}\alpha =\mathit{RootOf}\! \left(2 \textit{\_Z}^{4}-9 \textit{\_Z}^{3}+11 \textit{\_Z}^{2}-6 \textit{\_Z} +1\right)}{\textcolor{gray}{\sum}}\! \underline{\hspace{1.25 ex}}\alpha^{-n +1}\right)}{1423}+\frac{76 \left(\munderset{\underline{\hspace{1.25 ex}}\alpha =\mathit{RootOf}\! \left(2 \textit{\_Z}^{4}-9 \textit{\_Z}^{3}+11 \textit{\_Z}^{2}-6 \textit{\_Z} +1\right)}{\textcolor{gray}{\sum}}\! \underline{\hspace{1.25 ex}}\alpha^{-n}\right)}{1423}+\frac{20 \left(\munderset{\underline{\hspace{1.25 ex}}\alpha =\mathit{RootOf}\! \left(2 \textit{\_Z}^{4}-9 \textit{\_Z}^{3}+11 \textit{\_Z}^{2}-6 \textit{\_Z} +1\right)}{\textcolor{gray}{\sum}}\! \underline{\hspace{1.25 ex}}\alpha^{-n -1}\right)}{1423}

Recurrence in maple format:
a(0) = 1
a(1) = 1
a(2) = 2
a(3) = 6
a(n+4) = -2*a(n)+9*a(n+1)-11*a(n+2)+6*a(n+3), n >= 4

Recurrence in latex format:
a \! \left(0\right) = 1
a \! \left(1\right) = 1
a \! \left(2\right) = 2
a \! \left(3\right) = 6
a \! \left(n +4\right) = -2 a \! \left(n \right)+9 a \! \left(n +1\right)-11 a \! \left(n +2\right)+6 a \! \left(n +3\right), \quad n \geq 4

Specification 1
Strategy pack name: point_placements
Tree: http://permpal.com/tree/345/
System of equations in Maple syntax:
F[0,x] = F[1,x]+F[2,x]
F[1,x] = 1
F[2,x] = F[3,x]
F[3,x] = F[15,x]*F[4,x]
F[4,x] = F[0,x]+F[5,x]
F[5,x] = F[2,x]+F[6,x]
F[6,x] = F[7,x]
F[7,x] = F[15,x]*F[8,x]
F[8,x] = F[5,x]+F[9,x]
F[9,x] = F[10,x]*F[2,x]
F[10,x] = F[11,x]+F[22,x]
F[11,x] = F[12,x]+F[16,x]
F[12,x] = F[1,x]+F[13,x]
F[13,x] = F[14,x]
F[14,x] = F[12,x]*F[15,x]
F[15,x] = x
F[16,x] = F[13,x]+F[17,x]
F[17,x] = F[18,x]+F[19,x]+F[21,x]
F[18,x] = 0
F[19,x] = F[15,x]*F[20,x]
F[20,x] = F[13,x]+F[17,x]
F[21,x] = F[15,x]*F[16,x]
F[22,x] = F[13,x]+F[23,x]
F[23,x] = F[18,x]+F[24,x]+F[26,x]
F[24,x] = F[15,x]*F[25,x]
F[25,x] = F[13,x]+F[23,x]
F[26,x] = F[15,x]*F[22,x]
System of equations in latex syntax:
F_{0}\! \left(x \right) = F_{1}\! \left(x \right)+F_{2}\! \left(x \right)
F_{1}\! \left(x \right) = 1
F_{2}\! \left(x \right) = F_{3}\! \left(x \right)
F_{3}\! \left(x \right) = F_{15}\! \left(x \right) F_{4}\! \left(x \right)
F_{4}\! \left(x \right) = F_{0}\! \left(x \right)+F_{5}\! \left(x \right)
F_{5}\! \left(x \right) = F_{2}\! \left(x \right)+F_{6}\! \left(x \right)
F_{6}\! \left(x \right) = F_{7}\! \left(x \right)
F_{7}\! \left(x \right) = F_{15}\! \left(x \right) F_{8}\! \left(x \right)
F_{8}\! \left(x \right) = F_{5}\! \left(x \right)+F_{9}\! \left(x \right)
F_{9}\! \left(x \right) = F_{10}\! \left(x \right) F_{2}\! \left(x \right)
F_{10}\! \left(x \right) = F_{11}\! \left(x \right)+F_{22}\! \left(x \right)
F_{11}\! \left(x \right) = F_{12}\! \left(x \right)+F_{16}\! \left(x \right)
F_{12}\! \left(x \right) = F_{1}\! \left(x \right)+F_{13}\! \left(x \right)
F_{13}\! \left(x \right) = F_{14}\! \left(x \right)
F_{14}\! \left(x \right) = F_{12}\! \left(x \right) F_{15}\! \left(x \right)
F_{15}\! \left(x \right) = x
F_{16}\! \left(x \right) = F_{13}\! \left(x \right)+F_{17}\! \left(x \right)
F_{17}\! \left(x \right) = F_{18}\! \left(x \right)+F_{19}\! \left(x \right)+F_{21}\! \left(x \right)
F_{18}\! \left(x \right) = 0
F_{19}\! \left(x \right) = F_{15}\! \left(x \right) F_{20}\! \left(x \right)
F_{20}\! \left(x \right) = F_{13}\! \left(x \right)+F_{17}\! \left(x \right)
F_{21}\! \left(x \right) = F_{15}\! \left(x \right) F_{16}\! \left(x \right)
F_{22}\! \left(x \right) = F_{13}\! \left(x \right)+F_{23}\! \left(x \right)
F_{23}\! \left(x \right) = F_{18}\! \left(x \right)+F_{24}\! \left(x \right)+F_{26}\! \left(x \right)
F_{24}\! \left(x \right) = F_{15}\! \left(x \right) F_{25}\! \left(x \right)
F_{25}\! \left(x \right) = F_{13}\! \left(x \right)+F_{23}\! \left(x \right)
F_{26}\! \left(x \right) = F_{15}\! \left(x \right) F_{22}\! \left(x \right)
System of equations in sympy syntax:
Eq(F_0(x), F_1(x) + F_2(x))
Eq(F_1(x), 1)
Eq(F_2(x), F_3(x))
Eq(F_3(x), F_15(x)*F_4(x))
Eq(F_4(x), F_0(x) + F_5(x))
Eq(F_5(x), F_2(x) + F_6(x))
Eq(F_6(x), F_7(x))
Eq(F_7(x), F_15(x)*F_8(x))
Eq(F_8(x), F_5(x) + F_9(x))
Eq(F_9(x), F_10(x)*F_2(x))
Eq(F_10(x), F_11(x) + F_22(x))
Eq(F_11(x), F_12(x) + F_16(x))
Eq(F_12(x), F_1(x) + F_13(x))
Eq(F_13(x), F_14(x))
Eq(F_14(x), F_12(x)*F_15(x))
Eq(F_15(x), x)
Eq(F_16(x), F_13(x) + F_17(x))
Eq(F_17(x), F_18(x) + F_19(x) + F_21(x))
Eq(F_18(x), 0)
Eq(F_19(x), F_15(x)*F_20(x))
Eq(F_20(x), F_13(x) + F_17(x))
Eq(F_21(x), F_15(x)*F_16(x))
Eq(F_22(x), F_13(x) + F_23(x))
Eq(F_23(x), F_18(x) + F_24(x) + F_26(x))
Eq(F_24(x), F_15(x)*F_25(x))
Eq(F_25(x), F_13(x) + F_23(x))
Eq(F_26(x), F_15(x)*F_22(x))
Pack JSON:
{"expansion_strats": [[{"class_module": "tilings.strategies.requirement_insertion", "extra_basis": [], "ignore_parent": false, "maxreqlen": 1, "one_cell_only": false, "strategy_class": "CellInsertionFactory"}, {"class_module": "tilings.strategies.requirement_placement", "dirs": [0, 1, 2, 3], "ignore_parent": false, "partial": false, "point_only": false, "strategy_class": "PatternPlacementFactory"}]], "inferral_strats": [{"class_module": "tilings.strategies.row_and_col_separation", "ignore_parent": true, "inferrable": true, "possibly_empty": false, "strategy_class": "RowColumnSeparationStrategy", "workable": true}, {"class_module": "tilings.strategies.obstruction_inferral", "strategy_class": "ObstructionTransitivityFactory"}], "initial_strats": [{"class_module": "tilings.strategies.factor", "ignore_parent": true, "interleaving": null, "strategy_class": "FactorFactory", "tracked": false, "unions": false, "workable": true}], "iterative": false, "name": "point_placements", "symmetries": [], "ver_strats": [{"class_module": "tilings.strategies.verification", "strategy_class": "BasicVerificationStrategy"}, {"class_module": "tilings.strategies.verification", "ignore_parent": true, "strategy_class": "InsertionEncodingVerificationStrategy"}, {"basis": [], "class_module": "tilings.strategies.verification", "ignore_parent": true, "strategy_class": "OneByOneVerificationStrategy", "symmetry": false}, {"basis": [], "class_module": "tilings.strategies.verification", "ignore_parent": true, "strategy_class": "LocallyFactorableVerificationStrategy", "symmetry": false}]}
Specification JSON:
{"root": {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0, 2, 3, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 3, 1, 2], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}], "requirements": []}, "rules": [{"children": [{"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0], "pos": [[0, 0]]}], "requirements": []}, {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0, 2, 3, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 3, 1, 2], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}], "requirements": [[{"patt": [0], "pos": [[0, 0]]}]]}], "class_module": "comb_spec_searcher.strategies.rule", "comb_class": {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0, 2, 3, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 3, 1, 2], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}], "requirements": []}, "rule_class": "Rule", "strategy": {"class_module": "tilings.strategies.requirement_insertion", "gps": [{"patt": [0], "pos": [[0, 0]]}], "ignore_parent": false, "strategy_class": "RequirementInsertionStrategy"}}, {"class_module": "comb_spec_searcher.strategies.rule", "comb_class": {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0], "pos": [[0, 0]]}], "requirements": []}, "rule_class": "VerificationRule", "strategy": {"class_module": "tilings.strategies.verification", "strategy_class": "BasicVerificationStrategy"}}, {"children": [{"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0, 1, 2], "pos": [[0, 0], [0, 1], [0, 1]]}, {"patt": [0, 2, 1], "pos": [[0, 0], [0, 1], [0, 0]]}, {"patt": [1, 2, 0], "pos": [[0, 1], [0, 1], [0, 0]]}, {"patt": [0, 2, 3, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 2, 3, 1], "pos": [[0, 1], [0, 1], [0, 1], [0, 1]]}, {"patt": [0, 3, 1, 2], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 3, 1, 2], "pos": [[0, 1], [0, 1], [0, 1], [0, 1]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 1], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 1], [0, 1], [0, 1], [0, 1]]}], "requirements": []}, {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0, 1], "pos": [[0, 0], [0, 0]]}, {"patt": [1, 0], "pos": [[0, 0], [0, 0]]}], "requirements": [[{"patt": [0], "pos": [[0, 0]]}]]}], "class_module": "comb_spec_searcher.strategies.rule", "comb_class": {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0], "pos": [[0, 1]]}, {"patt": [0], "pos": [[1, 0]]}, {"patt": [0], "pos": [[1, 2]]}, {"patt": [0, 1], "pos": [[1, 1], [1, 1]]}, {"patt": [1, 0], "pos": [[1, 1], [1, 1]]}, {"patt": [0, 1, 2], "pos": [[0, 0], [0, 2], [0, 2]]}, {"patt": [0, 2, 1], "pos": [[0, 0], [0, 2], [0, 0]]}, {"patt": [1, 2, 0], "pos": [[0, 2], [0, 2], [0, 0]]}, {"patt": [0, 2, 3, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 2, 3, 1], "pos": [[0, 2], [0, 2], [0, 2], [0, 2]]}, {"patt": [0, 3, 1, 2], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 3, 1, 2], "pos": [[0, 2], [0, 2], [0, 2], [0, 2]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 2], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 2], [0, 2], [0, 2], [0, 2]]}], "requirements": [[{"patt": [0], "pos": [[1, 1]]}]]}, "rule_class": "Rule", "strategy": {"class_module": "tilings.strategies.factor", "ignore_parent": true, "partition": [[[0, 0], [0, 2]], [[1, 1]]], "strategy_class": "FactorStrategy", "workable": 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