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Number of multiplicity free permutations in S_n, i.e., permutations whose Stanley symmetric function is multiplicity free.
2

%I #26 Jul 17 2017 02:24:17

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

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

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

%H S. Billey and B. Pawlowski, <a href="https://arxiv.org/abs/1304.7870">Permutation Patterns, Stanley symmetric functions and generalized Specht modules</a>, arXiv:1304.7870 [math.CO], 2013.

%Y Cf. A005802, A223905, A224318.

%K nonn,more

%O 1,2

%A _Sara Billey_, Apr 04 2013