A225967 Number of permutations of [n] having exactly 6 strong fixed blocks.

1, 21, 273, 2874, 27243, 246037, 2192863, 19766016, 183564396, 1782944112, 18338911012, 201770228316, 2392011321782, 30683876823738, 426312246308898, 6403885291569540, 103619141358704966, 1797448899803758010, 33259985875540203746, 653383741590779444772

Offset: 16

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 = 16..460

Crossrefs

Column k=6 of A186373.

Formula

a(n) ~ 5 * n! / n^14. - Vaclav Kotesovec, Aug 29 2014