Counting occurrences of 132 in an even permutation
classification
🧮 math.CO
keywords
evenfunctionoccurrencespermutationsamountscheckcontainingcounting
read the original abstract
We study the generating function for the number of even (or odd) permutations on n letters containing exactly $r\gs0$ occurrences of 132. It is shown that finding this function for a given r amounts to a routine check of all permutations in $S_{2r}$.
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