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A011909 [ n(n-1)(n-2)/27 ]. 0
0, 0, 0, 0, 0, 2, 4, 7, 12, 18, 26, 36, 48, 63, 80, 101, 124, 151, 181, 215, 253, 295, 342, 393, 449, 511, 577, 650, 728, 812, 902, 998, 1102, 1212, 1329, 1454, 1586, 1726, 1874, 2030, 2195, 2368, 2551, 2742, 2943 (list; graph; refs; listen; history; internal format)
OFFSET

0,6

CROSSREFS

Sequence in context: A005521 A135901 A124197 * A065962 A173722 A049703

Adjacent sequences:  A011906 A011907 A011908 * A011910 A011911 A011912

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 14 06:20 EST 2012. Contains 205570 sequences.