Number of circular permutations of length n without 3-sequences.

A165961

Number of circular permutations of length n without 3-sequences.

Terms

    a(0) =1a(1) =5a(2) =20a(3) =102a(4) =627a(5) =4461a(6) =36155a(7) =328849a(8) =3317272a(9) =36757822a(10) =443846693a(11) =5800991345a(12) =81593004021

External references