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

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..96
• Index entries for sequences related to factorial numbers

Crossrefs

Column 5 in triangle A009963.

Programs

Mathematica

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

Extensions

Offset changed to 1 by Seiichi Manyama, Aug 14 2023