Refined Restricted Permutations Avoiding Subsets of Patterns of Length Three
classification
🧮 math.CO
keywords
patternspermutationssubseteqavoidavoidingdefineenumerateexactly
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Define $S_n^k(T)$ to be the set of permutations of $\{1,2,...,n\}$ with exactly $k$ fixed points which avoid all patterns in $T \subseteq S_m$. We enumerate $S_n^k(T)$, $T \subseteq S_3$, for all $|T| \geq 2$ and $0 \leq k \leq n$.
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