Classical and vincular patterns of length three in generalized alternating permutations

Zhenhua Luo, Junting Wang, Ziyi Yang +2

Let k be an integer at least 2, and let D_{N,k} be the set of permutations of {1,...,N} whose descent set is exactly {k, 2k, ..., k*floor((N-1)/k)}. We enumerate the elements of D_…