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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