OFFSET
0,2
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 110.
LINKS
G. Nebe and N. J. A. Sloane, Home page for this lattice
EXAMPLE
1 + 240*q^2 + 10920*q^4 + 163520*q^6 + 1075860*q^8 + 4464096*q^10 + 14909440*q^12 + 40080000*q^14 + O(q^15)
MATHEMATICA
terms = 20; f[q_] = LatticeData["A15", "ThetaSeriesFunction"][-I Log[q]/Pi]; s = Series[f[q], {q, 0, 2 terms}]; CoefficientList[s, q^2][[1 ;; terms]] // Round (* Jean-François Alcover, Jul 07 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Robert.Harley(AT)inria.fr, see A023902.
More terms from Sean A. Irvine, Jun 12 2019
STATUS
approved