Number of 3-good permutations on {1,2,...,n}, i.e., permutations that contain each of the six patterns {123, 132, 213, 231, 312, 321} as a subsequence.

A124188

Number of 3-good permutations on {1,2,...,n}, i.e., permutations that contain each of the six patterns {123, 132, 213, 231, 312, 321} as a subsequence.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =218a(6) =3070a(7) =32972a(8) =336196a(9) =3533026a(10) =39574122a(11) =477773658a(12) =6222603756a(13) =87162325448

External references