References to A006523

Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n) for n odd.
2, 240, 725760, 12454041600, 711374856192000, 102181884343418880000

1 seqfan posts

Tue Oct 27 08:48:02 CET 2009    [seqfan] Working demo and webpage
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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