Av(1234, 1324, 1342, 1423, 2341)
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Generating Function
\(\displaystyle \frac{\left(-x^{2}-x +1\right) \sqrt{1-4 x}+3 x^{2}+x -1}{4 x^{2}-2 x}\)
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Counting Sequence
1, 1, 2, 6, 19, 61, 198, 651, 2171, 7345, 25194, 87516, 307462, 1091026, 3905580, ...
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Implicit Equation for the Generating Function
\(\displaystyle x \left(2 x -1\right)^{2} F \left(x \right)^{2}-\left(2 x -1\right) \left(3 x^{2}+x -1\right) F \! \left(x \right)+x^{4}+4 x^{3}-3 x +1 = 0\)
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Recurrence
\(\displaystyle a \! \left(0\right) = 1\)
\(\displaystyle a \! \left(1\right) = 1\)
\(\displaystyle a \! \left(2\right) = 2\)
\(\displaystyle a \! \left(3\right) = 6\)
\(\displaystyle a \! \left(4\right) = 19\)
\(\displaystyle a \! \left(n +4\right) = \frac{4 \left(2 n -1\right) a \! \left(n \right)}{n +5}+\frac{2 \left(n +6\right) a \! \left(1+n \right)}{n +5}-\frac{13 \left(n +3\right) a \! \left(n +2\right)}{n +5}+\frac{\left(27+7 n \right) a \! \left(n +3\right)}{n +5}, \quad n \geq 5\)
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This specification was found using the strategy pack "Row Placements Tracked Fusion" and has 102 rules.

Found on July 23, 2021.

Finding the specification took 2 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_{11}\! \left(x \right) F_{3}\! \left(x \right)\\ F_{3}\! \left(x \right) &= F_{1}\! \left(x \right)+F_{101}\! \left(x \right)+F_{4}\! \left(x \right)\\ F_{4}\! \left(x \right) &= F_{11}\! \left(x \right) F_{5}\! \left(x \right)\\ F_{5}\! \left(x \right) &= F_{6}\! \left(x , 1\right)\\ F_{6}\! \left(x , y\right) &= F_{1}\! \left(x \right)+F_{12}\! \left(x , y\right)+F_{7}\! \left(x , y\right)+F_{9}\! \left(x , y\right)\\ F_{7}\! \left(x , y\right) &= F_{6}\! \left(x , y\right) F_{8}\! \left(x , y\right)\\ F_{8}\! \left(x , y\right) &= y x\\ F_{9}\! \left(x , y\right) &= F_{10}\! \left(x , y\right) F_{11}\! \left(x \right)\\ F_{10}\! \left(x , y\right) &= \frac{y F_{6}\! \left(x , y\right)-F_{6}\! \left(x , 1\right)}{-1+y}\\ F_{11}\! \left(x \right) &= x\\ F_{12}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{13}\! \left(x , y\right)\\ F_{13}\! \left(x , y\right) &= F_{14}\! \left(x \right)+F_{53}\! \left(x , y\right)\\ F_{14}\! \left(x \right) &= F_{15}\! \left(x \right)+F_{22}\! \left(x \right)\\ F_{15}\! \left(x \right) &= F_{16}\! \left(x \right)+F_{19}\! \left(x \right)\\ F_{16}\! \left(x \right) &= F_{1}\! \left(x \right)+F_{17}\! \left(x \right)\\ F_{17}\! \left(x \right) &= F_{18}\! \left(x \right)\\ F_{18}\! \left(x \right) &= F_{11}\! \left(x \right) F_{16}\! \left(x \right)\\ F_{19}\! \left(x \right) &= F_{11}\! \left(x \right)+F_{20}\! \left(x \right)\\ F_{20}\! \left(x \right) &= F_{21}\! \left(x \right)\\ F_{21}\! \left(x \right) &= F_{11}\! \left(x \right) F_{17}\! \left(x \right)\\ F_{22}\! \left(x \right) &= F_{23}\! \left(x \right)+F_{52}\! \left(x \right)\\ F_{23}\! \left(x \right) &= F_{24}\! \left(x \right)+F_{36}\! \left(x \right)\\ F_{24}\! \left(x \right) &= F_{25}\! \left(x \right)\\ F_{25}\! \left(x \right) &= F_{11}\! \left(x \right) F_{26}\! \left(x \right)\\ F_{26}\! \left(x \right) &= F_{27}\! \left(x \right)+F_{28}\! \left(x \right)\\ F_{27}\! \left(x \right) &= F_{1}\! \left(x \right)+F_{11}\! \left(x \right)\\ F_{28}\! \left(x \right) &= F_{24}\! \left(x \right)+F_{29}\! \left(x \right)\\ F_{29}\! \left(x \right) &= F_{30}\! \left(x \right)+F_{31}\! \left(x \right)+F_{35}\! \left(x \right)\\ F_{30}\! \left(x \right) &= 0\\ F_{31}\! \left(x \right) &= F_{11}\! \left(x \right) F_{32}\! \left(x \right)\\ F_{32}\! \left(x \right) &= F_{33}\! \left(x \right)+F_{34}\! \left(x \right)\\ F_{33}\! \left(x \right) &= F_{11}\! \left(x \right)\\ F_{34}\! \left(x \right) &= F_{29}\! \left(x \right)\\ F_{35}\! \left(x \right) &= F_{11}\! \left(x \right) F_{24}\! \left(x \right)\\ F_{36}\! \left(x \right) &= F_{30}\! \left(x \right)+F_{37}\! \left(x \right)+F_{47}\! \left(x \right)\\ F_{37}\! \left(x \right) &= F_{11}\! \left(x \right) F_{38}\! \left(x \right)\\ F_{38}\! \left(x \right) &= F_{39}\! \left(x \right)+F_{40}\! \left(x \right)\\ F_{39}\! \left(x \right) &= F_{17}\! \left(x \right)+F_{20}\! \left(x \right)\\ F_{40}\! \left(x \right) &= F_{36}\! \left(x \right)+F_{41}\! \left(x \right)\\ F_{41}\! \left(x \right) &= 2 F_{30}\! \left(x \right)+F_{42}\! \left(x \right)+F_{46}\! \left(x \right)\\ F_{42}\! \left(x \right) &= F_{11}\! \left(x \right) F_{43}\! \left(x \right)\\ F_{43}\! \left(x \right) &= F_{44}\! \left(x \right)+F_{45}\! \left(x \right)\\ F_{44}\! \left(x \right) &= F_{20}\! \left(x \right)\\ F_{45}\! \left(x \right) &= F_{41}\! \left(x \right)\\ F_{46}\! \left(x \right) &= F_{11}\! \left(x \right) F_{36}\! \left(x \right)\\ F_{47}\! \left(x \right) &= F_{11}\! \left(x \right) F_{48}\! \left(x \right)\\ F_{48}\! \left(x \right) &= F_{17}\! \left(x \right)+F_{49}\! \left(x \right)\\ F_{49}\! \left(x \right) &= F_{30}\! \left(x \right)+F_{47}\! \left(x \right)+F_{50}\! \left(x \right)\\ F_{50}\! \left(x \right) &= F_{11}\! \left(x \right) F_{51}\! \left(x \right)\\ F_{51}\! \left(x \right) &= F_{17}\! \left(x \right)+F_{49}\! \left(x \right)\\ F_{52}\! \left(x \right) &= F_{29}\! \left(x \right)+F_{41}\! \left(x \right)\\ F_{53}\! \left(x , y\right) &= F_{54}\! \left(x , y\right)+F_{68}\! \left(x , y\right)\\ F_{54}\! \left(x , y\right) &= F_{55}\! \left(x , y\right)+F_{63}\! \left(x , y\right)\\ F_{55}\! \left(x , y\right) &= F_{56}\! \left(x , y\right)+F_{59}\! \left(x , y\right)\\ F_{56}\! \left(x , y\right) &= F_{57}\! \left(x , y\right)\\ F_{57}\! \left(x , y\right) &= F_{58}\! \left(x , y\right) F_{8}\! \left(x , y\right)\\ F_{58}\! \left(x , y\right) &= F_{1}\! \left(x \right)+F_{56}\! \left(x , y\right)\\ F_{59}\! \left(x , y\right) &= F_{30}\! \left(x \right)+F_{60}\! \left(x , y\right)+F_{62}\! \left(x , y\right)\\ F_{60}\! \left(x , y\right) &= F_{61}\! \left(x , y\right) F_{8}\! \left(x , y\right)\\ F_{61}\! \left(x , y\right) &= F_{17}\! \left(x \right)+F_{59}\! \left(x , y\right)\\ F_{62}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{55}\! \left(x , y\right)\\ F_{63}\! \left(x , y\right) &= F_{64}\! \left(x , y\right)+F_{66}\! \left(x , y\right)\\ F_{64}\! \left(x , y\right) &= F_{65}\! \left(x , y\right)\\ F_{65}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{56}\! \left(x , y\right)\\ F_{66}\! \left(x , y\right) &= F_{67}\! \left(x , y\right)\\ F_{67}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{59}\! \left(x , y\right)\\ F_{68}\! \left(x , y\right) &= F_{100}\! \left(x , y\right)+F_{69}\! \left(x , y\right)\\ F_{69}\! \left(x , y\right) &= F_{70}\! \left(x , y\right)+F_{81}\! \left(x , y\right)\\ F_{70}\! \left(x , y\right) &= F_{71}\! \left(x , y\right)\\ F_{71}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{72}\! \left(x , y\right)\\ F_{72}\! \left(x , y\right) &= F_{73}\! \left(x , y\right)+F_{74}\! \left(x , y\right)\\ F_{73}\! \left(x , y\right) &= F_{56}\! \left(x , y\right)+F_{64}\! \left(x , y\right)\\ F_{74}\! \left(x , y\right) &= F_{70}\! \left(x , y\right)+F_{75}\! \left(x , y\right)\\ F_{75}\! \left(x , y\right) &= 2 F_{30}\! \left(x \right)+F_{76}\! \left(x , y\right)+F_{80}\! \left(x , y\right)\\ F_{76}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{77}\! \left(x , y\right)\\ F_{77}\! \left(x , y\right) &= F_{78}\! \left(x , y\right)+F_{79}\! \left(x , y\right)\\ F_{78}\! \left(x , y\right) &= F_{64}\! \left(x , y\right)\\ F_{79}\! \left(x , y\right) &= F_{75}\! \left(x , y\right)\\ F_{80}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{70}\! \left(x , y\right)\\ F_{81}\! \left(x , y\right) &= 2 F_{30}\! \left(x \right)+F_{82}\! \left(x , y\right)+F_{92}\! \left(x , y\right)\\ F_{82}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{83}\! \left(x , y\right)\\ F_{83}\! \left(x , y\right) &= F_{84}\! \left(x , y\right)+F_{85}\! \left(x , y\right)\\ F_{84}\! \left(x , y\right) &= F_{59}\! \left(x , y\right)+F_{66}\! \left(x , y\right)\\ F_{85}\! \left(x , y\right) &= F_{81}\! \left(x , y\right)+F_{86}\! \left(x , y\right)\\ F_{86}\! \left(x , y\right) &= 3 F_{30}\! \left(x \right)+F_{87}\! \left(x , y\right)+F_{91}\! \left(x , y\right)\\ F_{87}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{88}\! \left(x , y\right)\\ F_{88}\! \left(x , y\right) &= F_{89}\! \left(x , y\right)+F_{90}\! \left(x , y\right)\\ F_{89}\! \left(x , y\right) &= F_{66}\! \left(x , y\right)\\ F_{90}\! \left(x , y\right) &= F_{86}\! \left(x , y\right)\\ F_{91}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{81}\! \left(x , y\right)\\ F_{92}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{93}\! \left(x , y\right)\\ F_{93}\! \left(x , y\right) &= F_{94}\! \left(x , y\right)+F_{97}\! \left(x , y\right)\\ F_{94}\! \left(x , y\right) &= F_{95}\! \left(x , y\right)\\ F_{95}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{96}\! \left(x , y\right)\\ F_{96}\! \left(x , y\right) &= F_{56}\! \left(x , y\right)+F_{94}\! \left(x , y\right)\\ F_{97}\! \left(x , y\right) &= 2 F_{30}\! \left(x \right)+F_{92}\! \left(x , y\right)+F_{98}\! \left(x , y\right)\\ F_{98}\! \left(x , y\right) &= F_{11}\! \left(x \right) F_{99}\! \left(x , y\right)\\ F_{99}\! \left(x , y\right) &= F_{59}\! \left(x , y\right)+F_{97}\! \left(x , y\right)\\ F_{100}\! \left(x , y\right) &= F_{75}\! \left(x , y\right)+F_{86}\! \left(x , y\right)\\ F_{101}\! \left(x \right) &= F_{11}\! \left(x \right) F_{14}\! \left(x \right)\\ \end{align*}\)