References to A003683

2^(n-1)*(2^n - (-1)^n)/3.
0, 1, 2, 12, 40, 176, 672, 2752, 10880, 43776, 174592, 699392, 2795520, 11186176

1 seqfan posts

Thu Feb 5 17:23:06 CET 2009    [seqfan] More conjectures on sequence products
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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