A022046 Theta series of D_15 lattice.

1, 420, 21870, 331240, 2128260, 8972712, 29822520, 80027280, 193511790, 409172940, 825736296, 1509537960, 2698852520, 4472616120, 7347537600, 11335886864, 17520853380, 25553816400, 37658603350, 52706867640, 74655559272, 100969845200, 138840872040, 182317633680

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

References

• J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 118.

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..10000

Programs

Mathematica

terms = 20; f[q_] = LatticeData["D15", "ThetaSeriesFunction"][-I*Log[q]/Pi]; s = f[q] + O[q]^(2 terms); DeleteCases[CoefficientList[s, q], 0][[1 ;; terms]] (* Jean-François Alcover, Jul 06 2017 *)

Extensions

More terms from Seiichi Manyama, Oct 16 2018