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A139578
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a(n) = n(2n+13).
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6
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0, 15, 34, 57, 84, 115, 150, 189, 232, 279, 330, 385, 444, 507, 574, 645, 720, 799, 882, 969, 1060, 1155, 1254, 1357, 1464, 1575, 1690, 1809, 1932, 2059, 2190, 2325, 2464, 2607, 2754, 2905, 3060, 3219, 3382, 3549, 3720, 3895, 4074
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 2*n^2 + 13*n.
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MATHEMATICA
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Table[n(2n+13), {n, 0, 50}] (* or *) LinearRecurrence[{3, -3, 1}, {0, 15, 34}, 50] (* Harvey P. Dale, Nov 22 2014 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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