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A225965
Number of permutations of [n] having exactly 4 strong fixed blocks.
2
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
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
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 22 2013
STATUS
approved