A161563 Factorials of double factorials.

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

Offset

0,3

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!!!.

Links

Table of n, a(n) for n=0..6.

Mathematica

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

Crossrefs

Sequence in context: A337096 A005607 A184391 * A135408 A165710 A151995

Adjacent sequences: A161560 A161561 A161562 * A161564 A161565 A161566

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Jun 13 2009

Extensions

Corrected by Charles R Greathouse IV, Nov 11 2009

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

Status

approved