A010799 a(n) = n!*(n+1)!*(n+2)!*(n+3)!*(n+4)! / ( 2!*3!*4!*5! ).

1, 720, 1814400, 12192768000, 184354652160000, 5574884681318400000, 309071606732292096000000, 29374165503837040803840000000, 4536546120412592581745049600000000

Offset

1,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..96

Index entries for sequences related to factorial numbers

Mathematica

With[{c=Times@@(Range[2, 5]!), l=Times@@@Partition[Range[20]!, 5, 1]}, #/c&/@l] (* Harvey P. Dale, Nov 10 2011 *)

Crossrefs

Column 5 in triangle A009963.

Sequence in context: A054779 A030185 A227668 * A283830 A075754 A318711

Adjacent sequences: A010796 A010797 A010798 * A010800 A010801 A010802

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

Offset changed to 1 by Seiichi Manyama, Aug 14 2023

Status

approved