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A001818
Squares of double factorials: (1*3*5*...*(2n-1))^2 = ((2*n-1)!!)^2.
(Formerly M4669 N1997)
+0
22
1, 1, 9, 225, 11025, 893025, 108056025, 18261468225, 4108830350625, 1187451971330625, 428670161650355625, 189043541287806830625, 100004033341249813400625, 62502520838281133375390625
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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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