%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