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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 (list; graph; refs; listen; history; text; internal format)
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
Sequence in context: A228397 A164871 A226436 * A079106 A247472 A224295
KEYWORD
nonn,more
AUTHOR
Sara Billey, Apr 03 2013
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Jul 31 2019
STATUS
approved

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Last modified February 24 05:49 EST 2024. Contains 370293 sequences. (Running on oeis4.)