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A226283 [n/2]!*[(n+1)/2]!*C([n/2],2)*C([(n+1)/2],2). 3
0, 0, 0, 4, 36, 324, 2592, 20736, 172800, 1440000, 12960000, 116640000, 1143072000, 11202105600, 119489126400, 1274550681600, 14748372172800, 170659735142400, 2133246689280000, 26665583616000000, 358503957504000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
Number of permutations of n elements with 4 odd displacements.
Column 3 of A226288.
Column k=4 of A145893, a diagonal of A145894. - Alois P. Heinz, May 29 2014
LINKS
CROSSREFS
Sequence in context: A279581 A093186 A000765 * A270473 A288269 A189334
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

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)