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A109764
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Sum of the first n^2 squares.
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0
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0, 14, 204, 1240, 4900, 14910, 38024, 85344, 173880, 328350, 583220, 984984, 1594684, 2490670, 3771600, 5559680, 8004144, 11284974, 15616860, 21253400, 28491540, 37676254, 49205464, 63535200, 81185000, 102743550, 128874564
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = n^2*(n^2-1)*(2*n^2-1)/6. G.f.: 2*x^2*(1+x)*(7*x^2+46*x+7)/(1-x)^7. [From R. J. Mathar, Jun 28 2010]
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PROG
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(PARI) for(j=1, 50, print1(sum(i=0, j^2-1, i^2), ", ")) (Klasen)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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