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A033562
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a(n) = 2*n^3 + 1.
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9
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1, 3, 17, 55, 129, 251, 433, 687, 1025, 1459, 2001, 2663, 3457, 4395, 5489, 6751, 8193, 9827, 11665, 13719, 16001, 18523, 21297, 24335, 27649, 31251, 35153, 39367, 43905, 48779, 54001, 59583, 65537, 71875, 78609, 85751, 93313, 101307, 109745, 118639, 128001
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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E.g.f.: (1 + 2*x + 6*x^2 + 2*x^3)*exp(x). - G. C. Greubel, Oct 12 2019
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MAPLE
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MATHEMATICA
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CoefficientList[Series[1+x*(3+5x+5x^2-x^3)/(1-x)^4, {x, 0, 40}], x] (* Vincenzo Librandi, Mar 13 2012 *)
LinearRecurrence[{4, -6, 4, -1}, {1, 3, 17, 55}, 50] (* Harvey P. Dale, Aug 14 2023 *)
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PROG
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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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EXTENSIONS
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STATUS
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approved
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