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A011891
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[ n(n-1)(n-2)/9 ].
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0
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0, 0, 0, 0, 2, 6, 13, 23, 37, 56, 80, 110, 146, 190, 242, 303, 373, 453, 544, 646, 760, 886, 1026, 1180, 1349, 1533, 1733, 1950, 2184, 2436, 2706, 2996, 3306, 3637, 3989, 4363, 4760, 5180, 5624, 6092, 6586
(list; graph; refs; listen; history; internal format)
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