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A050534 Tritriangular numbers: a(n)=binomial(binomial(n,2),2), i.e. a(n) = (1/8)n(n + 1)(n - 1)(n - 2). +0
20
0, 0, 0, 3, 15, 45, 105, 210, 378, 630, 990, 1485, 2145, 3003, 4095, 5460, 7140, 9180, 11628, 14535, 17955, 21945, 26565, 31878, 37950, 44850, 52650, 61425, 71253, 82215, 94395, 107880, 122760, 139128, 157080, 176715, 198135, 221445, 246753 (list; graph; listen)
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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.


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