A326761 Number of 321-avoiding permutations of length n whose squares also avoid the pattern 321.

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

Offset: 1

Author

Amanda Burcroff, Jul 23 2019

Keywords

• nonn
• more

Links

• Miklos Bona and Rebecca Smith, Pattern Avoidance in Permutations and Their Squares, arXiv:1901.00026 [math.CO], 2019.
• Amanda Burcroff and Colin Defant, Pattern-Avoiding Permutation Powers, arXiv:1907.09451 [math.CO], 2019.

Crossrefs

Cf. A326760, A326762, A326763.