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A140236
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Double tetrahedral numbers (or double pyramidal numbers): a(n) = k(k+1)(k+2)/6 where k = n(n+1)(n+2)/6.
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1
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0, 1, 20, 220, 1540, 7770, 30856, 102340, 295240, 762355, 1798940, 3939936, 8104460, 15803060, 29426320, 52636760, 90889616, 152112005, 247574180, 392991060, 609896980, 927341646, 1383960600, 2030479100, 2932714200
(list; graph; refs; listen; history; internal format)
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