A028918 (3n+1)!/(4*(3n-1)).

3, 252, 113400, 141523200, 373621248000, 1788898535424000, 14050009097220096000, 168600109166641152000000, 2931618698189556350976000000, 70886540122223472566599680000000, 2306506242496907350372020387840000000, 98312522080188178902256997011292160000000

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Mathematica

Table[(3n+1)!/(4(3n-1)), {n, 20}] (* Harvey P. Dale, Jul 27 2015 *)

Crossrefs

Sequence in context: A158351 A025418 A075901 * A213409 A227028 A279653

Adjacent sequences: A028915 A028916 A028917 * A028919 A028920 A028921

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved