A225968 - OEIS

%I #9 Aug 05 2015 17:00:08

%S 1,25,375,4439,46240,449376,4226604,39474916,373382588,3635491860,

%T 36957484104,397181210056,4560293779650,56383382731802,

%U 754184534296262,10926207562498862,171119131459887864,2885501334257214456,52124282589435604908,1003403354618592544692

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

%C See A186373 for the definition of strong fixed blocks.

%H Alois P. Heinz, <a href="/A225968/b225968.txt">Table of n, a(n) for n = 19..460</a>

%F a(n) ~ 6 * n! / n^17. - _Vaclav Kotesovec_, Aug 29 2014

%Y Column k=7 of A186373.

%K nonn

%O 19,2

%A _Alois P. Heinz_, May 22 2013