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A239449
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7*n^2 - 5*n + 1.
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3
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1, 3, 19, 49, 93, 151, 223, 309, 409, 523, 651, 793, 949, 1119, 1303, 1501, 1713, 1939, 2179, 2433, 2701, 2983, 3279, 3589, 3913, 4251, 4603, 4969, 5349, 5743, 6151, 6573, 7009, 7459, 7923, 8401, 8893, 9399, 9919, 10453, 11001, 11563, 12139, 12729, 13333
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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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MATHEMATICA
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CoefficientList[Series[(1 + 13 x^2)/(1 - x)^3, {x, 0, 50}], x] (* Vincenzo Librandi, Apr 02 2014 *)
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PROG
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(Haskell)
a239449 n = (7 * n - 5) * n + 1
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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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