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A167544
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a(n) = (n-3)*(n-8)/2.
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3
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-2, -3, -3, -2, 0, 3, 7, 12, 18, 25, 33, 42, 52, 63, 75, 88, 102, 117, 133, 150, 168, 187, 207, 228, 250, 273, 297, 322, 348, 375, 403, 432, 462, 493, 525, 558, 592, 627, 663, 700, 738, 777, 817, 858, 900, 943, 987, 1032, 1078, 1125, 1173
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OFFSET
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4,1
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COMMENTS
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Essentially a duplicate of A055998.
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LINKS
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FORMULA
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a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3).
G.f.: x^4*(-2 + 3*x)/(1-x)^3.
E.g.f.: (1/2)*( (24 -10*x + x^2)*exp(x) - (24 + 14*x + 3*x^2) ). - G. C. Greubel, Jul 30 2022
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MATHEMATICA
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Table[(n-3)*(n-8)/2, {n, 4, 60}] (* G. C. Greubel, Jun 15 2016 *)
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PROG
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(Magma) [(n-3)*(n-8)/2: n in [4..60]]; // G. C. Greubel, Jul 30 2022
(SageMath) [(n-3)*(n-8)/2 for n in (4..60)] # G. C. Greubel, Jul 30 2022
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CROSSREFS
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KEYWORD
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sign,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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