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A161563 Factorials of double factorials. 1


%S 1,1,2,6,40320,1307674368000,

%T 12413915592536072670862289047373375038521486354677760000000000

%N Factorials of double factorials.

%C 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!!!.

%t lst={};Do[AppendTo[lst,n!!! ],{n,0,9}];lst

%t (* alternately *) Array[ #!!!&,9,0]

%K nonn

%O 1,3

%A _Vladimir Joseph Stephan Orlovsky_, Jun 13 2009

%E Corrected by _Charles R Greathouse IV_, Nov 11 2009

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Last modified December 8 20:37 EST 2021. Contains 349596 sequences. (Running on oeis4.)