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A181179
a(1)=1; for n>=2, a(n) = 2*a(n-1)!.
0
1, 2, 4, 48, 24827831185072145341724578094746750077042972709355520000000000
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..5.
MATHEMATICA
NestList[2#!&, 1, 4] (*
Harvey P. Dale
, Aug 29 2015 *)
CROSSREFS
Sequence in context:
A097424
A228596
A032019
*
A175814
A303382
A303443
Adjacent sequences:
A181176
A181177
A181178
*
A181180
A181181
A181182
KEYWORD
nonn
AUTHOR
H Gee (harry987(AT)live.com.au), Oct 08 2010
EXTENSIONS
Corrected by
Harvey P. Dale
, Aug 29 2015
Definition changed by
Georg Fischer
, Jun 16 2021
STATUS
approved
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Last modified August 18 12:46 EDT 2024. Contains 375269 sequences. (Running on oeis4.)