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%I #29 Jul 22 2020 02:12:26
%S 1,1,1,2,5,12,30,86,253,748,2274,7152
%N Number of cyclic permutations of length n avoiding the pattern 231 (equivalently, 312).
%H Miklos Bona, Michael Cory, <a href="http://arxiv.org/abs/1805.05196">Cyclic Permutations Avoiding Pairs of Patterns of Length Three</a>, arXiv:1805.05196 [math.CO], 2018.
%e For n=4, there are two such permutations, 4123 and 4312.
%Y Cf. A309504, A309505, A309508.
%K nonn,more
%O 1,4
%A _Miklos Bona_, Aug 05 2019
%E a(1)=1 (confirmed by author) inserted by _Alexander Burstein_, Jul 20 2020
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