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A023904 Theta series of A_13 lattice. 0
1, 182, 6006, 62244, 290472, 996996, 2740738, 6362148, 13255242, 25357514, 45323278, 76444368, 123407466, 191916088, 287567280, 421168748, 601759340, 836876040, 1147564418, 1547518336, 2046646602 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 110.

LINKS

Table of n, a(n) for n=0..20.

MATHEMATICA

terms = 21; f[q_] = LatticeData["A13", "ThetaSeriesFunction"][-I*Log[q]/Pi]; s = f[q] + O[q]^(2 terms); Partition[CoefficientList[s, q] // Round, 2][[All, 1]][[1 ;; terms]] (* Jean-Fran├žois Alcover, Jul 06 2017 *)

CROSSREFS

Sequence in context: A186125 A209852 A321637 * A035839 A048546 A225712

Adjacent sequences:  A023901 A023902 A023903 * A023905 A023906 A023907

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Robert.Harley(AT)inria.fr, see A023902.

STATUS

approved

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Last modified May 23 11:20 EDT 2019. Contains 323514 sequences. (Running on oeis4.)