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A023911
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Theta series of A_20 lattice.
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0
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1, 420, 35910, 1093260, 15058680, 113446872, 579316080, 2329395060, 7731638460, 22367855300, 57613059966, 136098325440, 297252637920, 612084784920, 1190412837180, 2219090508852, 3958702871340, 6845564237400, 11427505500670, 18625710365640, 29498125917456
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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. 110.
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LINKS
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MATHEMATICA
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terms = 17; f[q_] = LatticeData["A20", "ThetaSeriesFunction"][-I*Log[q]/Pi]; s = f[q] + O[q]^(2 terms); Partition[CoefficientList[s, q] // Round, 2][[All, 1]][[1 ;; terms]] (* Jean-François Alcover, Jul 06 2017 *)
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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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More terms from Robert.Harley(AT)inria.fr, see A023902.
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STATUS
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approved
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