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A159038 a(n) = 8 * n!. 2
8, 16, 48, 192, 960, 5760, 40320, 322560, 2903040, 29030400, 319334400, 3832012800, 49816166400, 697426329600, 10461394944000, 167382319104000, 2845499424768000, 51218989645824000, 973160803270656000 (list; graph; refs; listen; history; text; internal format)
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: A297619 A188825 A214204 * A235055 A209997 A212764

Adjacent sequences:  A159035 A159036 A159037 * A159039 A159040 A159041

KEYWORD

easy,nonn

AUTHOR

Zerinvary Lajos, Apr 03 2009

STATUS

approved

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Last modified April 6 09:00 EDT 2020. Contains 333268 sequences. (Running on oeis4.)