The number of permutations of 1, 2,..., n such that none of 123, 132, 213, 231, 312, 321 appear in the permutation.

A269889

The number of permutations of 1, 2,..., n such that none of 123, 132, 213, 231, 312, 321 appear in the permutation.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =0a(4) =12a(5) =84a(6) =576a(7) =4320a(8) =36000a(9) =332640a(10) =3386880a(11) =37739520a(12) =457228800a(13) =5987520000a(14) =84304281600

External references