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0, 1, 2, 5, 4, 11, 6, 16, 12, 19, 10, 37, 12, 27, 26, 42, 16, 54, 18, 59, 36, 43, 22, 100, 32, 51, 48, 81, 28, 113, 30, 99, 56, 67, 54, 162, 36, 75, 66, 152, 40, 153, 42, 125, 108, 91, 46, 240, 60, 134, 86, 147, 52, 202, 82, 204, 96, 115, 58, 331, 60, 123, 144, 219, 96
(list;
graph;
refs;
listen;
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internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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G.f.: Sum_{k>=1} tau(k) * x^(2*k) / (1 - x^k)^2. - Ilya Gutkovskiy, Aug 19 2021
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MATHEMATICA
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PROG
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(PARI) a(n) = sumdiv(n, d, (d-1)*numdiv(n/d)) \\ Michel Marcus, Jun 17 2013
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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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