login
A224318
Number of 2-vexillary permutations in S_n, that, permutations whose Stanley symmetric function has at most 2 terms or at most 2 Edelman-Greene tableaux.
4
1, 1, 2, 6, 24, 118, 661, 4011, 25654, 170420, 1165697
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 03 2013
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Jul 31 2019
STATUS
approved