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A058372
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a(n) = -(n + 1)*(2*n^2 + n - 12)/6.
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1
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2, 3, 1, -6, -20, -43, -77, -124, -186, -265, -363, -482, -624, -791, -985, -1208, -1462, -1749, -2071, -2430, -2828, -3267, -3749, -4276, -4850, -5473, -6147, -6874, -7656, -8495, -9393, -10352, -11374, -12461, -13615, -14838, -16132, -17499, -18941, -20460, -22058, -23737
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..41.
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FORMULA
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G.f.: (2 - 5*x + x^2)/(1 - x)^4.
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MAPLE
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seq(-sum(k^2-2, k=0..n), n=0..41); # Zerinvary Lajos, Jan 28 2008
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MATHEMATICA
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s=0; lst={}; Do[s+=n^2-2; AppendTo[lst, s*-1], {n, 0, 6!, 1}]; lst (* Vladimir Joseph Stephan Orlovsky, Nov 07 2008 *)
(Magma) [-(n + 1)*(2*n^2 + n - 12)/6 : n in [0..80]]; // Wesley Ivan Hurt, Aug 19 2022
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CROSSREFS
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Sequence in context: A075263 A130850 A130405 * A128264 A232435 A114858
Adjacent sequences: A058369 A058370 A058371 * A058373 A058374 A058375
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KEYWORD
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sign,easy
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AUTHOR
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N. J. A. Sloane, Dec 18 2000
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STATUS
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approved
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