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A015243
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a(n) = (2*n - 9)*n^2.
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1
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0, -7, -20, -27, -16, 25, 108, 245, 448, 729, 1100, 1573, 2160, 2873, 3724, 4725, 5888, 7225, 8748, 10469, 12400, 14553, 16940, 19573, 22464, 25625, 29068, 32805, 36848, 41209, 45900, 50933, 56320, 62073
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4).
E.g.f.: x*(-7 - 3*x + 2*x^2)*exp(x). (End)
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MATHEMATICA
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Table[(2*n - 9)*n^2, {n, 0, 25}] (* or *) LinearRecurrence[{4, -6, 4, -1}, {0, -7, -20, -27}, 25] (* G. C. Greubel, Jul 30 2016 *)
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PROG
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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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