A225970 Number of permutations of [n] having exactly 9 strong fixed blocks.

1, 33, 627, 9073, 111870, 1248766, 13110889, 132972135, 1329550237, 13327791693, 135953350084, 1431074091372, 15754008527799, 183668908342603, 2292564722628641, 30882981325870191, 450836857113720902, 7132752605955632598, 121911367111794972727

Offset: 25

Author

Alois P. Heinz, May 22 2013

Keywords

• nonn

Comments

See A186373 for the definition of strong fixed blocks.

Links

• Alois P. Heinz, Table of n, a(n) for n = 25..470

Crossrefs

Column k=9 of A186373.

Formula

a(n) ~ 8 * n! / n^23. - Vaclav Kotesovec, Aug 29 2014