A159038 a(n) = 8 * n!.

8, 16, 48, 192, 960, 5760, 40320, 322560, 2903040, 29030400, 319334400, 3832012800, 49816166400, 697426329600, 10461394944000, 167382319104000, 2845499424768000, 51218989645824000, 973160803270656000

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081 [math.CO], 2014.

Formula

a(n) = 8 * A000142(n) for n > 0.

Maple

A159038 := proc(n)
    8*n! ;
end proc:
seq(A159038(n), n=1..10) ; # R. J. Mathar, Sep 30 2013

Crossrefs

Cf. A000142, A052560, A052578, A052648, A052849, A062098.

Sequence in context: A188825 A214204 A335771 * A235055 A209997 A212764

Adjacent sequences: A159035 A159036 A159037 * A159039 A159040 A159041

Keyword

easy,nonn

Author

Zerinvary Lajos, Apr 03 2009

Status

approved