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A002807 Sum_{k=3..n} (k-1)!*C(n,k)/2.
(Formerly M4420 N1867)
+0
6
0, 0, 0, 1, 7, 37, 197, 1172, 8018, 62814, 556014, 5488059, 59740609, 710771275, 9174170011, 127661752406, 1904975488436, 30341995265036, 513771331467372, 9215499383109573, 174548332364311563, 3481204991988351553, 72920994844093191553, 1600596371590399671784 (list; graph; listen)
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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.


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