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A058596
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McKay-Thompson series of class 26A for Monster.
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1
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1, 0, 4, 4, 10, 12, 26, 28, 51, 60, 102, 116, 189, 220, 336, 396, 575, 684, 974, 1152, 1588, 1892, 2554, 3032, 4017, 4780, 6234, 7404, 9519, 11292, 14368, 17012, 21402, 25308, 31552, 37228, 46039, 54216, 66566, 78232, 95384, 111892, 135624, 158764, 191359
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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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Expansion of A - 2 + 1/A, where A = (eta(q^2)*eta(q^13)/(eta(q)* eta(q^26)))^2, in powers of q. - G. C. Greubel, Jun 22 2018
a(n) ~ exp(2*Pi*sqrt(2*n/13)) / (2^(3/4) * 13^(1/4) * n^(3/4)). - Vaclav Kotesovec, Jun 28 2018
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EXAMPLE
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T26A = 1/q + 4*q + 4*q^2 + 10*q^3 + 12*q^4 + 26*q^5 + 28*q^6 + 51*q^7 + ...
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MATHEMATICA
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eta[q_] := q^(1/24)*QPochhammer[q]; A:= (eta[q^2]*eta[q^13]/(eta[q]* eta[q^26]))^2; a:= CoefficientList[Series[-2 + e26B + 1/e26B, {q, 0, 60}], q]; Table[a[[n]], {n, 1, 50}] (* G. C. Greubel, Jun 22 2018 *)
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PROG
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(PARI) q='q+O('q^50); A = (eta(q^2)*eta(q^13)/(eta(q)*eta(q^26)))^2/q; Vec(A - 2 + 1/A) \\ G. C. Greubel, Jun 22 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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