A225968 Number of permutations of [n] having exactly 7 strong fixed blocks.

1, 25, 375, 4439, 46240, 449376, 4226604, 39474916, 373382588, 3635491860, 36957484104, 397181210056, 4560293779650, 56383382731802, 754184534296262, 10926207562498862, 171119131459887864, 2885501334257214456, 52124282589435604908, 1003403354618592544692

Offset

19,2

Comments

See A186373 for the definition of strong fixed blocks.

Links

Alois P. Heinz, Table of n, a(n) for n = 19..460

Formula

a(n) ~ 6 * n! / n^17. - Vaclav Kotesovec, Aug 29 2014

Crossrefs

Column k=7 of A186373.

Sequence in context: A254376 A022749 A036071 * A094190 A069396 A228216

Adjacent sequences: A225965 A225966 A225967 * A225969 A225970 A225971

Keyword

nonn

Author

Alois P. Heinz, May 22 2013

Status

approved