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A007683 a(1) = 1; a(n) = - Sum (n+k)!a(k)/(2k)!, k = 1..n-1.
(Formerly M2289)
+0
3
1, -3, 3, 9, 21, -33, -1173, -13515, -113739, -532209, 6284379, 264830061, 5897799141, 104393462439, 1459983940203, 10308316834293, -308010522508395, -19576840707893409, -726806556195360069, -22261372611370303875, -591210850189999983099 (list; graph; listen)
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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.


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