A100089 a(n) = (3*n+1)!.

1, 24, 5040, 3628800, 6227020800, 20922789888000, 121645100408832000, 1124000727777607680000, 15511210043330985984000000, 304888344611713860501504000000, 8222838654177922817725562880000000

Offset: 0

Author

Jorge Coveiro, Dec 26 2004

Keywords

• nonn

Crossrefs

Cf. A000142, A143820.

Programs

Maple

seq( (3*n+1)!,n=0..13);

Mathematica

Table[(3*n+1)!, {n, 0, 10}] (* Amiram Eldar, Jun 23 2020 *)

Formula

Sum_{n>=0} 1/a(n) = A143820. - Amiram Eldar, Jun 23 2020

Extensions

Offset 0 and a(0) added by Amiram Eldar, Jun 23 2020