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A004671
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Theta series of extremal even unimodular lattice in dimension 40.
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1
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1, 0, 39600, 87859200, 20779902000, 1441891123200, 46065617928000, 861717856665600, 10894640750334000, 102119813013504000, 755967560945968800, 4623420024622080000, 24151651608982497600, 110516220812493619200
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internal format)
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OFFSET
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0,3
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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. 195.
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LINKS
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FORMULA
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EXAMPLE
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G.f.: 1 + 39600*q^2 + 87859200*q^3 + ...
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PROG
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(Sage)
e4 = eisenstein_series_qexp(4, 20, normalization = "integral");
delta = CuspForms(1, 12).0.q_expansion(20);
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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