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A309504
Number of cyclic permutations of length n avoiding the pattern 123.
3
1, 1, 2, 4, 10, 24, 68, 188, 586, 1722, 5492, 16924
OFFSET
1,3
LINKS
Miklos Bona, Michael Cory, Cyclic Permutations Avoiding Pairs of Patterns of Length Three, arXiv:1805.05196 [math.CO], 2018.
EXAMPLE
For n=3, there are two such permutations, 231 and 312.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Miklos Bona, Aug 05 2019
STATUS
approved