A028917 a(n) = (3*n+1)! / (24*n).

1, 105, 50400, 64864800, 174356582400, 844757641728000, 6690480522485760000, 80787552309015552000000, 1411520113943119724544000000, 34261827725741345073856512000000, 1118306056968197503210676551680000000, 47790809344535920299708262436044800000000

Offset

1,2

Links

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

Mathematica

Table[(3n+1)!/(24n), {n, 10}] (* Harvey P. Dale, Jan 31 2015 *)

Prog

(Magma) [Factorial(3*n+1)/(24*n): n in [1..20]]; // Vincenzo Librandi, Feb 01 2015

Crossrefs

Sequence in context: A054862 A391889 A348794 * A145627 A305146 A304644

Adjacent sequences: A028914 A028915 A028916 * A028918 A028919 A028920

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

a(11)-a(12) from Vincenzo Librandi, Feb 01 2015

Status

approved