A326761 - OEIS

%I #7 Aug 14 2019 07:51:02

%S 1,2,5,12,28,70,171,428,1062,2664,6664,16744,42018

%N Number of 321-avoiding permutations of length n whose squares also avoid the pattern 321.

%H Miklos Bona and Rebecca Smith, <a href="https://arxiv.org/abs/1901.00026">Pattern Avoidance in Permutations and Their Squares</a>, arXiv:1901.00026 [math.CO], 2019.

%H Amanda Burcroff and Colin Defant, <a href="https://arxiv.org/abs/1907.09451">Pattern-Avoiding Permutation Powers</a>, arXiv:1907.09451 [math.CO], 2019.

%Y Cf. A326760, A326762, A326763.

%K nonn,more

%O 1,2

%A _Amanda Burcroff_, Jul 23 2019