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A028918 (3n+1)!/(4*(3n-1)). 0
3, 252, 113400, 141523200, 373621248000, 1788898535424000, 14050009097220096000, 168600109166641152000000, 2931618698189556350976000000, 70886540122223472566599680000000, 2306506242496907350372020387840000000, 98312522080188178902256997011292160000000 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 19 21:35 EST 2018. Contains 297938 sequences.