login
A223034
Number of 3-vexillary permutations in S_n, that is, permutations whose Stanley symmetric function has at most 3 terms or at most 3 Edelman-Greene tableaux.
1
1, 1, 2, 6, 24, 120, 705, 4553, 30930, 216412, 1545469
OFFSET
0,3
COMMENTS
This family is characterized by a finite set of permutation patterns.
LINKS
S. Billey and B. Pawlowski, Permutation Patterns, Stanley symmetric functions and generalized Specht modules, arXiv:1304.7870 [math.CO], 2013.
Elizabeth Hartung, Hung Phuc Hoang, Torsten Mütze, Aaron Williams, Combinatorial generation via permutation languages. I. Fundamentals, arXiv:1906.06069 [cs.DM], 2019.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Sara Billey, Apr 04 2013
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Jul 31 2019
STATUS
approved