Av(1243, 1324, 1342, 2134, 3142)
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Generating Function
\(\displaystyle -\frac{\left(x -1\right) \left(2 x -1\right)^{2}}{x^{5}+3 x^{4}-10 x^{3}+12 x^{2}-6 x +1}\)
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Counting Sequence
1, 1, 2, 6, 19, 58, 173, 512, 1513, 4471, 13213, 39047, 115385, 340950, 1007440, ...
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Implicit Equation for the Generating Function
\(\displaystyle \left(x^{5}+3 x^{4}-10 x^{3}+12 x^{2}-6 x +1\right) F \! \left(x \right)+\left(x -1\right) \left(2 x -1\right)^{2} = 0\)
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Recurrence
\(\displaystyle a \! \left(0\right) = 1\)
\(\displaystyle a \! \left(1\right) = 1\)
\(\displaystyle a \! \left(2\right) = 2\)
\(\displaystyle a \! \left(3\right) = 6\)
\(\displaystyle a \! \left(4\right) = 19\)
\(\displaystyle a \! \left(n +5\right) = -a \! \left(n \right)-3 a \! \left(n +1\right)+10 a \! \left(n +2\right)-12 a \! \left(n +3\right)+6 a \! \left(n +4\right), \quad n \geq 5\)
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Explicit Closed Form
\(\displaystyle -\frac{3354 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =1\right)^{-n +3}}{13219}-\frac{3354 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =2\right)^{-n +3}}{13219}-\frac{3354 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =3\right)^{-n +3}}{13219}-\frac{3354 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =4\right)^{-n +3}}{13219}-\frac{3354 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =5\right)^{-n +3}}{13219}-\frac{12536 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =1\right)^{-n +2}}{13219}-\frac{12536 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =2\right)^{-n +2}}{13219}-\frac{12536 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =3\right)^{-n +2}}{13219}-\frac{12536 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =4\right)^{-n +2}}{13219}-\frac{12536 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =5\right)^{-n +2}}{13219}+\frac{24569 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =1\right)^{-n +1}}{13219}+\frac{24569 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =2\right)^{-n +1}}{13219}+\frac{24569 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =3\right)^{-n +1}}{13219}+\frac{24569 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =4\right)^{-n +1}}{13219}+\frac{24569 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =5\right)^{-n +1}}{13219}+\frac{5263 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =1\right)^{-n -1}}{13219}+\frac{5263 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =2\right)^{-n -1}}{13219}+\frac{5263 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =3\right)^{-n -1}}{13219}+\frac{5263 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =4\right)^{-n -1}}{13219}+\frac{5263 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =5\right)^{-n -1}}{13219}-\frac{18854 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =1\right)^{-n}}{13219}-\frac{18854 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =2\right)^{-n}}{13219}-\frac{18854 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =3\right)^{-n}}{13219}-\frac{18854 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =4\right)^{-n}}{13219}-\frac{18854 \mathit{RootOf} \left(Z^{5}+3 Z^{4}-10 Z^{3}+12 Z^{2}-6 Z +1, \mathit{index} =5\right)^{-n}}{13219}\)
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This specification was found using the strategy pack "Point Placements" and has 53 rules.

Found on January 18, 2022.

Finding the specification took 1 seconds.

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\(\begin{align*} 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_{4}\! \left(x \right) F_{5}\! \left(x \right)\\ F_{4}\! \left(x \right) &= x\\ F_{5}\! \left(x \right) &= F_{14}\! \left(x \right)+F_{6}\! \left(x \right)\\ F_{6}\! \left(x \right) &= F_{1}\! \left(x \right)+F_{7}\! \left(x \right)\\ F_{7}\! \left(x \right) &= F_{8}\! \left(x \right)\\ F_{8}\! \left(x \right) &= F_{4}\! \left(x \right) F_{9}\! \left(x \right)\\ F_{9}\! \left(x \right) &= F_{10}\! \left(x \right)+F_{13}\! \left(x \right)\\ F_{10}\! \left(x \right) &= F_{1}\! \left(x \right)+F_{11}\! \left(x \right)\\ F_{11}\! \left(x \right) &= F_{12}\! \left(x \right)\\ F_{12}\! \left(x \right) &= F_{10}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{13}\! \left(x \right) &= F_{7}\! \left(x \right)\\ F_{14}\! \left(x \right) &= F_{15}\! \left(x \right)+F_{2}\! \left(x \right)\\ F_{15}\! \left(x \right) &= F_{16}\! \left(x \right)+F_{17}\! \left(x \right)+F_{47}\! \left(x \right)\\ F_{16}\! \left(x \right) &= 0\\ F_{17}\! \left(x \right) &= F_{18}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{18}\! \left(x \right) &= F_{19}\! \left(x \right)+F_{29}\! \left(x \right)\\ F_{19}\! \left(x \right) &= F_{20}\! \left(x \right)+F_{23}\! \left(x \right)\\ F_{20}\! \left(x \right) &= F_{21}\! \left(x \right)\\ F_{21}\! \left(x \right) &= F_{22}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{22}\! \left(x \right) &= F_{1}\! \left(x \right)+F_{20}\! \left(x \right)\\ F_{23}\! \left(x \right) &= F_{24}\! \left(x \right)\\ F_{24}\! \left(x \right) &= F_{25}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{25}\! \left(x \right) &= F_{26}\! \left(x \right)\\ F_{26}\! \left(x \right) &= F_{27}\! \left(x \right)+F_{4}\! \left(x \right)\\ F_{27}\! \left(x \right) &= F_{28}\! \left(x \right)\\ F_{28}\! \left(x \right) &= F_{26}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{29}\! \left(x \right) &= F_{30}\! \left(x \right)+F_{33}\! \left(x \right)\\ F_{30}\! \left(x \right) &= F_{16}\! \left(x \right)+F_{17}\! \left(x \right)+F_{31}\! \left(x \right)\\ F_{31}\! \left(x \right) &= F_{32}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{32}\! \left(x \right) &= F_{2}\! \left(x \right)+F_{30}\! \left(x \right)\\ F_{33}\! \left(x \right) &= F_{34}\! \left(x \right)\\ F_{34}\! \left(x \right) &= F_{35}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{35}\! \left(x \right) &= F_{36}\! \left(x \right)\\ F_{36}\! \left(x \right) &= F_{37}\! \left(x \right)+F_{45}\! \left(x \right)\\ F_{37}\! \left(x \right) &= F_{16}\! \left(x \right)+F_{38}\! \left(x \right)+F_{44}\! \left(x \right)\\ F_{38}\! \left(x \right) &= F_{39}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{39}\! \left(x \right) &= F_{40}\! \left(x \right)+F_{42}\! \left(x \right)\\ F_{40}\! \left(x \right) &= F_{4}\! \left(x \right)+F_{41}\! \left(x \right)\\ F_{41}\! \left(x \right) &= F_{24}\! \left(x \right)\\ F_{42}\! \left(x \right) &= F_{37}\! \left(x \right)+F_{43}\! \left(x \right)\\ F_{43}\! \left(x \right) &= F_{34}\! \left(x \right)\\ F_{44}\! \left(x \right) &= F_{2}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{45}\! \left(x \right) &= F_{46}\! \left(x \right)\\ F_{46}\! \left(x \right) &= F_{36}\! \left(x \right) F_{4}\! \left(x \right)\\ F_{47}\! \left(x \right) &= F_{4}\! \left(x \right) F_{48}\! \left(x \right)\\ F_{48}\! \left(x \right) &= F_{49}\! \left(x \right)+F_{52}\! \left(x \right)\\ F_{49}\! \left(x \right) &= F_{2}\! \left(x \right)+F_{50}\! \left(x \right)\\ F_{50}\! \left(x \right) &= F_{16}\! \left(x \right)+F_{38}\! \left(x \right)+F_{51}\! \left(x \right)\\ F_{51}\! \left(x \right) &= F_{4}\! \left(x \right) F_{49}\! \left(x \right)\\ F_{52}\! \left(x \right) &= F_{15}\! \left(x \right)\\ \end{align*}\)