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A008660
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Theta series of direct sum of 4 copies of D_4 lattice.
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1
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1, 96, 3552, 62592, 528864, 2191680, 8951424, 23321856, 67105248, 134971872, 319970880, 550300032, 1147717248, 1771816512, 3371135232, 4826361600, 8594190816, 11587029696, 19592103264
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OFFSET
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0,2
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REFERENCES
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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 119.
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LINKS
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MATHEMATICA
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terms = 19; s = (1/2 (EllipticTheta[3, 0, q]^4 + EllipticTheta[4, 0, q]^4) )^4 + O[q]^(2 terms); CoefficientList[s, q^2] (* Jean-François Alcover, Jul 08 2017 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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