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A008435
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Theta series of {D_7}^{+} packing.
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1
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1, 0, 0, 0, 0, 0, 0, 64, 84, 0, 0, 0, 0, 0, 0, 448, 574, 0, 0, 0, 0, 0, 0, 1344, 1288, 0, 0, 0, 0, 0, 0, 2688, 3444, 0, 0, 0, 0, 0, 0, 4928, 4424, 0, 0, 0, 0, 0, 0, 8064, 9240, 0, 0, 0, 0, 0, 0, 11200, 11088, 0, 0, 0
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OFFSET
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0,8
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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. 120.
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LINKS
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FORMULA
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Expansion of (theta_2(q)^7 + theta_3(q)^7 + theta_4(q)^7)/2 in powers of q^(1/4).
Expansion of (Sum_{k=-inf..inf} q^((k+1/2)^2))^7 + (Sum_{k=-inf..inf} q^(k^2))^7 + (Sum_{k=-inf..inf} (-1)^k * q^(k^2))^7 in powers of q^(1/4). (End)
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EXAMPLE
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G.f.: 1 + 64*q^(7/4) + 84*q^2 + 448*q^(15/4) + 574*q^4 + ... .
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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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