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A007911
(n-1)!!-(n-2)!!.
+0
2
1, 1, 5, 7, 33, 57, 279, 561, 2895, 6555, 35685, 89055, 509985, 1381905, 8294895, 24137505, 151335135, 468934515, 3061162125, 10033419375, 68000295825, 234484536825, 1645756410375, 5943863027025, 43105900812975
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.
AT&T Labs Research
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