A022054 Theta series of D_23 lattice.

1, 1012, 141726, 6503112, 130905236, 1392036360, 9401213016, 47412641232, 192747766686, 663612939132, 2007831887432, 5456890474248, 13617909938952, 31527898462552, 68719323996224, 141662701280848, 279248601010324, 527242669347856, 961796734667878, 1695182770403416

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..1000

Programs

Mathematica

terms = 16; f[q_] = LatticeData["D23", "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