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A023903 Theta series of A_12 lattice. 0
1, 156, 4290, 36036, 141726, 449592, 1098812, 2417844, 4575714, 8556132, 13981110, 23250084, 34902582, 53549496, 75168522, 109953272, 146737890, 204766848, 265082246, 357073860, 447493332 (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["A12", "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: A065699 A263290 A275766 * A240005 A035838 A035824

Adjacent sequences:  A023900 A023901 A023902 * A023904 A023905 A023906

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 April 19 10:45 EDT 2019. Contains 322255 sequences. (Running on oeis4.)