References to A002807

Sum_{k=3..n} (k-1)!*C(n,k)/2.
0, 0, 0, 1, 7, 37, 197, 1172, 8018, 62814, 556014, 5488059, 59740609, 710771275

1 seqfan posts

Tue Feb 3 23:26:57 CET 2009    [seqfan] Re: Broken Link in A006285
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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