A161563 Factorials of double factorials.

1, 1, 2, 6, 40320, 1307674368000, 12413915592536072670862289047373375038521486354677760000000000

Offset: 0

Author

Vladimir Joseph Stephan Orlovsky, Jun 13 2009

Keywords

• nonn

Comments

As of version 7, Mathematica parses n!!! as (n!!)!. This sequence is not to be confused with the triple factorials A007661 or A161474 which are usually denoted n!!!.

Programs

Mathematica

lst={};Do[AppendTo[lst,n!!! ],{n,0,9}];lst
(* alternatively *) Array[ #!!!&,9,0]

Extensions

Corrected by Charles R Greathouse IV, Nov 11 2009

Offset set to 0 by Alois P. Heinz, Jan 12 2022