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A157375
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a(n) = 2401*n^2 - 980*n + 99.
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3
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1520, 7743, 18768, 34595, 55224, 80655, 110888, 145923, 185760, 230399, 279840, 334083, 393128, 456975, 525624, 599075, 677328, 760383, 848240, 940899, 1038360, 1140623, 1247688, 1359555, 1476224, 1597695, 1723968, 1855043, 1990920
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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E.g.f.: (49*x*(49*x + 29) + 99)*exp(x) - 99. - G. C. Greubel, Feb 04 2018
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MATHEMATICA
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LinearRecurrence[{3, -3, 1}, {1520, 7743, 18768}, 40] (* Vincenzo Librandi, Jan 28 2012 *)
Table[2401*n^2 - 980*n + 99, {n, 1, 30}] (* G. C. Greubel, Feb 04 2018 *)
CoefficientList[Series[(-1520-3183x-99x^2)/(-1+x)^3, {x, 0, 40}], x] (* Harvey P. Dale, Jul 27 2021 *)
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PROG
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(Magma) I:=[1520, 7743, 18768]; [n le 3 select I[n] else 3*Self(n-1)-3*Self(n-2)+1*Self(n-3): n in [1..40]]; // Vincenzo Librandi, Jan 28 2012
(PARI) for(n=1, 40, print1(2401*n^2 - 980*n + 99", ")); \\ Vincenzo Librandi, Jan 28 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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