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A023909
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Theta series of A_18 lattice.
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1
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1, 342, 23256, 548454, 5756202, 33953760, 145404264, 501480756, 1455087222, 3744992834, 8666394912, 18652602708, 37257431778, 70992509796, 127919023344, 222954244860, 372270931974, 606984681420, 955026275808, 1477806578172, 2218909983696, 3290673763164
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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 = 18; f[q_] = LatticeData["A18", "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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