A225965 Number of permutations of [n] having exactly 4 strong fixed blocks.

1, 13, 117, 928, 7125, 55527, 451472, 3896347, 36098855, 361638248, 3932908263, 46483325765, 596325240445, 8278698772954, 123863754811374, 1988038987565688, 34070987657660446, 620747700139873322, 11975106447284305656, 243741719070454243530

Offset

10,2

Comments

See A186373 for the definition of strong fixed blocks.

Links

Alois P. Heinz, Table of n, a(n) for n = 10..450

Formula

a(n) ~ 3 * n! / n^8. - Vaclav Kotesovec, Aug 29 2014

Crossrefs

Column k=4 of A186373.

Sequence in context: A250557 A022737 A016295 * A051824 A367244 A016285

Adjacent sequences: A225962 A225963 A225964 * A225966 A225967 A225968

Keyword

nonn

Author

Alois P. Heinz, May 22 2013

Status

approved