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A058372
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a(n) = -(n + 1)*(2*n^2 + n - 12)/6.
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2
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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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FORMULA
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G.f.: (2 - 5*x + x^2)/(1 - x)^4.
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MATHEMATICA
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LinearRecurrence[{4, -6, 4, -1}, {2, 3, 1, -6}, 100] (* Paolo Xausa, Oct 22 2023 *)
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PROG
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(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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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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