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A058551
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McKay-Thompson series of class 20B for Monster.
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1
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1, 2, 9, 10, 28, 30, 73, 96, 165, 212, 358, 468, 746, 950, 1449, 1844, 2727, 3480, 4935, 6288, 8715, 11056, 15091, 18990, 25468, 31910, 42225, 52752, 68785, 85536, 110371, 136744, 174816, 215480, 273152, 335388, 421909, 516244, 644550, 785784, 974921, 1184430, 1461239, 1768900
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OFFSET
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-1,2
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LINKS
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FORMULA
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Expansion of A + 4*q/A, where A = q^(1/2)*(eta(q)*eta(q^5)/(eta(q^2) *eta(q^10)))^2, in powers of q. - G. C. Greubel, Jun 21 2018
a(n) ~ exp(2*Pi*sqrt(n/5)) / (2 * 5^(1/4) * n^(3/4)). - Vaclav Kotesovec, Jun 28 2018
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EXAMPLE
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T20B = 1/q + 2*q + 9*q^3 + 10*q^5 + 28*q^7 + 30*q^9 + 73*q^11 + 96*q^13 + ...
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MATHEMATICA
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eta[q_]:= q^(1/24)*QPochhammer[q]; A:= q^(1/2)*(eta[q]*eta[q^5]/(eta[q^2] *eta[q^10]))^2; a:= CoefficientList[Series[A + 4*q/A, {q, 0, 60}], q]; Table[a[[n]], {n, 1, 50}] (* G. C. Greubel, Jun 21 2018 *)
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PROG
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(PARI) q='q+O('q^50); A = (eta(q)*eta(q^5)/(eta(q^2) *eta(q^10)))^2; Vec(A + 4*q/A) \\ G. C. Greubel, Jun 21 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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