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1, 5, 11, 25, 39, 61, 83, 113, 143, 181, 219, 265, 311, 365, 419, 481, 543, 613, 683, 761, 839, 925, 1011, 1105, 1199, 1301, 1403, 1513, 1623, 1741, 1859, 1985, 2111, 2245, 2379, 2521, 2663, 2813, 2963, 3121, 3279, 3445, 3611, 3785, 3959, 4141, 4323, 4513, 4703, 4901, 5099, 5305, 5511, 5725
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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 + 2*n - (-1)^n for n >= 1.
G.f.: (1+3*x+x^2+5*x^3-2*x^4)/((1+x)*(1-x)^3). (End)
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MAPLE
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1, seq(2*n^2 + 2*n - (-1)^n, n=1..100); # Robert Israel, Dec 22 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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