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A058762
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McKay-Thompson series of class 87A for Monster.
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1
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1, 0, 0, 1, 1, 1, 2, 1, 2, 2, 2, 2, 4, 3, 4, 5, 5, 5, 8, 7, 8, 10, 10, 11, 15, 14, 16, 19, 20, 21, 27, 26, 30, 35, 36, 39, 47, 47, 52, 60, 63, 68, 80, 81, 90, 101, 106, 114, 132, 135, 148, 165, 174, 187, 212, 219, 239, 264, 279, 299, 334, 348, 377, 414, 438
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OFFSET
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-1,7
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COMMENTS
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Also McKay-Thompson series of class 87B for Monster. - Michel Marcus, Feb 24 2014
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LINKS
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FORMULA
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Expansion of (1/4)*( -3 - T29A(q) - T29A(q^3) + sqrt((3 + T29A(q) + T29A(q^2))^2 + 8*(T29A(q)*T29A(q^3) - 3)) ) in powers of q, where T29A(q) is the g.f. of A058611. - G. C. Greubel, Jul 01 2018 [Corrected by Sean A. Irvine, Sep 16 2020]
a(n) ~ exp(4*Pi*sqrt(n/87)) / (sqrt(2) * 87^(1/4) * n^(3/4)). - Vaclav Kotesovec, Jul 02 2018
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EXAMPLE
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T87A = 1/q + q^2 + q^3 + q^4 + 2*q^5 + q^6 + 2*q^7 + 2*q^8 + 2*q^9 + 2*q^10 + ...
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MATHEMATICA
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QP := QPochhammer; nmax = 100;
f[x_, y_] := QP[-x, x*y]*QP[-y, x*y]* QP[x*y, x*y];
G[x_] := f[-x^2, -x^3]/f[-x, -x^2];
H[x_] := f[-x, -x^4]/f[-x, -x^2];
A := G[x^29]*G[x] + x^6*H[x^29]*H[x];
T29A := -2 + A^2/x;
T87A := (1/4)*( -3 - T29A - (T29A/.{x -> x^3}) + ((3 + T29A + (T29A/.{x -> x^3}))^2 + 8*( T29A*(T29A /. {x -> x^3}) - 3) + O[x]^nmax)^(1/2) );
a:= CoefficientList[Series[x*T87A, {x, 0, nmax}], x];
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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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