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A001621
n*(n+1)*(n^2+n+2)/4.
+0
3
0, 2, 12, 42, 110, 240, 462, 812, 1332, 2070, 3080, 4422, 6162, 8372, 11130, 14520, 18632, 23562, 29412, 36290, 44310, 53592, 64262, 76452, 90300, 105950, 123552, 143262, 165242, 189660, 216690
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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