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A326761
Number of 321-avoiding permutations of length n whose squares also avoid the pattern 321.
3
1, 2, 5, 12, 28, 70, 171, 428, 1062, 2664, 6664, 16744, 42018
OFFSET
1,2
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
KEYWORD
nonn,more
AUTHOR
Amanda Burcroff, Jul 23 2019
STATUS
approved