A181179 - OEIS

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A181179

a(1)=1; for n>=2, a(n) = 2*a(n-1)!.

%I #6 Jun 16 2021 15:18:44

%S 1,2,4,48,

%T 24827831185072145341724578094746750077042972709355520000000000

%N a(1)=1; for n>=2, a(n) = 2*a(n-1)!.

%t NestList[2#!&,1,4] (* _Harvey P. Dale_, Aug 29 2015 *)

%K nonn

%O 1,2

%A H Gee (harry987(AT)live.com.au), Oct 08 2010

%E Corrected by _Harvey P. Dale_, Aug 29 2015

%E Definition changed by _Georg Fischer_, Jun 16 2021