A224287 Number of multiplicity free permutations in S_n, i.e., permutations whose Stanley symmetric function is multiplicity free.

1, 2, 6, 24, 120, 718, 4956, 38180, 319280, 2837959

Offset: 1

Author

Sara Billey, Apr 04 2013

Keywords

• nonn
• more

Comments

This family is conjectured to be characterized by a finite set of patterns up to S_11.

Links

• S. Billey and B. Pawlowski, Permutation Patterns, Stanley symmetric functions and generalized Specht modules, arXiv:1304.7870 [math.CO], 2013.

Crossrefs

Cf. A005802, A223905, A224318.