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A224287
Number of multiplicity free permutations in S_n, i.e., permutations whose Stanley symmetric function is multiplicity free.
2
1, 2, 6, 24, 120, 718, 4956, 38180, 319280, 2837959
OFFSET
1,2
COMMENTS
This family is conjectured to be characterized by a finite set of patterns up to S_11.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Sara Billey, Apr 04 2013
STATUS
approved