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A006882
Double factorials n!!: a(n)=n*a(n-2).
(Formerly M0876)
+0
86
1, 1, 2, 3, 8, 15, 48, 105, 384, 945, 3840, 10395, 46080, 135135, 645120, 2027025, 10321920, 34459425, 185794560, 654729075, 3715891200, 13749310575, 81749606400, 316234143225, 1961990553600, 7905853580625, 51011754393600
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 25 08:46 EST 2009. Contains 167481 sequences.
AT&T Labs Research
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