Key points are not available for this paper at this time.
The theta function of a sphere packing gives the number of centers at each distance from the origin. The theta functions of a number of important packings (A₍, D₍, E₍, the Leech lattice, and others) and tables of the first fifty or so of their coefficients are given in this paper.
N. J. A. Sloane (Fri,) studied this question.