A226285 [n/2]!*[(n+1)/2]!*C([n/2],4)*C([(n+1)/2],4).

0, 0, 0, 0, 0, 0, 0, 576, 14400, 360000, 6480000, 116640000, 1905120000, 31116960000, 497871360000, 7965941760000, 129048256512000, 2090581755494400, 34843029258240000, 580717154304000000, 10038110810112000000

Offset

1,8

Comments

Number of permutations of n elements with 8 odd displacements.

Column 5 of A226288.

Column k=8 of A145893, a diagonal of A145894. - Alois P. Heinz, May 29 2014

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Sequence in context: A264524 A209781 A330840 * A370226 A354021 A282780

Adjacent sequences: A226282 A226283 A226284 * A226286 A226287 A226288

Keyword

nonn

Author

R. H. Hardin, connection of formula with combinatoric problem via N. J. A. Sloane in the Sequence Fans Mailing List, Jun 02 2013

Status

approved