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A123023
a(n) = b(n)*n!, where b(n+2)=n*b(n)/((n+2)*(n+1)), b(0)=0, b(1)=1.
+0
1
1, 1, 0, 1, 0, 3, 0, 15, 0, 105, 0, 945, 0, 10395, 0, 135135, 0, 2027025, 0, 34459425, 0, 654729075, 0, 13749310575, 0, 316234143225, 0, 7905853580625, 0, 213458046676875, 0
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.
AT&T Labs Research
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