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arxiv: math/0401218 · v1 · submitted 2004-01-18 · 🧮 math.CO

Counting occurrences of 3412 in an involution

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keywords functioninvolutionslettersoccurrencesamountscheckcontainingcounting
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We study the generating function for the number of involutions on $n$ letters containing exactly $r\gs0$ occurrences of 3412. It is shown that finding this function for a given $r$ amounts to a routine check of all involutions on $2r+1$ letters.

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