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A002866
a(0) = 1; for n>0, a(n) = 2^(n-1)*n!.
(Formerly M3604 N1463)
+0
28
1, 1, 4, 24, 192, 1920, 23040, 322560, 5160960, 92897280, 1857945600, 40874803200, 980995276800, 25505877196800, 714164561510400, 21424936845312000, 685597979049984000, 23310331287699456000
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.
AT&T Labs Research
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