Ting Guo, Christian Krattenthaler and Yi Zhang

On (shape-)Wilf equivalence for words

(13 pages)

Abstract. Stankova and West showed that for any non-negative integer s and any permutation γ of {4,5,,,,,s+3} there are as many permutations that avoid 231γ as there are that avoid 312γ. We extend this result to the setting of words.

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