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A241577
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n^3 + 4*n^2 - 5*n + 1.
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4
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1, 1, 15, 49, 109, 201, 331, 505, 729, 1009, 1351, 1761, 2245, 2809, 3459, 4201, 5041, 5985, 7039, 8209, 9501, 10921, 12475, 14169, 16009, 18001, 20151, 22465, 24949, 27609, 30451, 33481, 36705, 40129, 43759, 47601, 51661, 55945, 60459, 65209, 70201, 75441, 80935, 86689, 92709, 99001, 105571, 112425, 119569
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OFFSET
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0,3
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LINKS
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FORMULA
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Recurrence: a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4). - Fung Lam, May 11 2014
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MATHEMATICA
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CoefficientList[Series[(1 - 3 x + 17 x^2 - 9 x^3)/(1 - x)^4, {x, 0, 50}], x] (* Vincenzo Librandi, Apr 28 2014 *)
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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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STATUS
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approved
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