Conjectural Wilf-equivalences for vincular patterns of length four

A vincular pattern is a permutation pattern in which adjacent entries joined without a dash must occur consecutively in an occurrence; write \equiv for Wilf-equivalence, meaning that two patterns are avoided by the same number of permutations of every length. The patterns below have length four.

Wilf-equivalence conjecture. The following Wilf-equivalences hold:

23-1-41-23-423\text{-}1\text{-}4 \equiv 1\text{-}23\text{-}4
14-2-32-14-3.14\text{-}2\text{-}3 \equiv 2\text{-}14\text{-}3.

These are the only two conjectural equivalences remaining in the authors' summary of the Wilf-classification of vincular patterns of length four with one or two internal dashes, and both had been confirmed computationally for n9n\leq 9.

Sources & referencesView supporting material

Primary source

Andrew M. Baxter and Mark Shattuck, “Some Wilf-equivalences for vincular patterns”, arXiv:1309.7111 (2014).

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