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A007681
(2n+1)^2 n!.
(Formerly M4632)
+0
2
1, 9, 50, 294, 1944, 14520, 121680, 1134000, 11652480, 130999680, 1600300800, 21115987200, 299376000000, 4539498163200, 73316942899200, 1256675067648000, 22784918188032000, 435717099417600000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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