Number of cyclic permutations of length n that avoid the pattern 132 (equivalently, 213).

A309505

Number of cyclic permutations of length n that avoid the pattern 132 (equivalently, 213).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =10a(6) =24a(7) =68a(8) =182a(9) =544a(10) =1574a(11) =4888a(12) =14864a(13) =47610a(14) =149964a(15) =491802a(16) =1592198a(17) =5318936a(18) =17593170a(19) =59679516a(20) =200805614a(21) =689988886a(22) =2354489616a(23) =8178944510a(24) =28240716098

External references