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%I #8 Jul 06 2017 10:56:02
%S 1,552,63756,2704064,53183682,567173376,3844954344,19344711936,
%T 78707396790,270865553048,819741312720,2227781467584,5559628500716,
%U 12871144053504,28053560345184,57835101053184,114001594899018
%N Theta series of A_23 lattice.
%D J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 110.
%t terms = 17; f[q_] = LatticeData["A23", "ThetaSeriesFunction"][-I*Log[q]/Pi]; s = f[q] + O[q]^(2 terms); Partition[CoefficientList[s, q] // Round, 2][[All, 1]][[1 ;; terms]] (* _Jean-François Alcover_, Jul 06 2017 *)
%K nonn
%O 0,2
%A _N. J. A. Sloane_.
%E More terms from Robert.Harley(AT)inria.fr, see A023902.
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