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A010053
4^n*(2*n+1)!*(n!)^2/(n+1).
+0
1
1, 12, 2560, 2903040, 10701766656, 98099527680000, 1888892391260160000, 68028459471234662400000, 4210629057689788455321600000, 419914246162041071241548267520000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
AT&T Labs Research
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