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A281266
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Main diagonal of A279928.
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6
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1, -1, -1, -1, 23, -51, 35, -197, 1367, -3889, 7649, -26258, 112739, -350676, 939623, -3063201, 11022167, -35276497, 106320311, -344831533, 1164544273, -3765456206, 11890410454, -38631658591, 127610160227, -414671018176, 1335126443260, -4348160271568
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,5
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LINKS
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FORMULA
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a(n) ~ (-1)^n * c * d^n / sqrt(n), where d = 3.31585574856163070436... and c = 0.20250147602443379616... - Vaclav Kotesovec, Apr 17 2017
a(n) = [x^n] exp(n*Sum_{k>=1} (-1)^k*x^k/(k*(1 - x^k)^2)). - Ilya Gutkovskiy, May 30 2018
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MATHEMATICA
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nmax = 30; Table[SeriesCoefficient[Product[1/(1 + x^k)^(m*k), {k, 1, m}], {x, 0, m}], {m, 0, nmax}] (* Vaclav Kotesovec, Apr 17 2017 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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