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A023912 Theta series of A_21 lattice. 0

%I

%S 1,462,43890,1501500,23437722,198944592,1114627514,4828206900,

%T 17160463320,52574485502,143000133276,353652649308,808266398940,

%U 1728870130680,3496186881264,6732994928660,12429951473478

%N Theta series of A_21 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["A21", "ThetaSeriesFunction"][-I*Log[q]/Pi]; s = f[q] + O[q]^(2 terms); Partition[CoefficientList[s, q] // Round, 2][[All, 1]][[1 ;; terms]] (* _Jean-Fran├žois 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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Last modified January 18 01:10 EST 2022. Contains 350410 sequences. (Running on oeis4.)