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A223905
Number of 4-vexillary permutations in S_n, that is, permutations whose Stanley symmetric function has at most 4 terms or at most 4 Edelman-Greene tableaux.
4
1, 1, 2, 6, 24, 120, 717, 4824, 34629, 256689, 1935301
OFFSET
0,3
COMMENTS
This family is characterized by a finite set of 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
Sequence in context: A121987 A324132 A177524 * A374620 A164872 A226437
KEYWORD
nonn,more
AUTHOR
Sara Billey, Apr 04 2013
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Jul 31 2019
STATUS
approved