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A023914 Theta series of A_23 lattice. 0
1, 552, 63756, 2704064, 53183682, 567173376, 3844954344, 19344711936, 78707396790, 270865553048, 819741312720, 2227781467584, 5559628500716, 12871144053504, 28053560345184, 57835101053184, 114001594899018 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 110.

LINKS

Table of n, a(n) for n=0..16.

MATHEMATICA

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-Fran├žois Alcover, Jul 06 2017 *)

CROSSREFS

Sequence in context: A189549 A282595 A290048 * A035849 A028686 A247531

Adjacent sequences:  A023911 A023912 A023913 * A023915 A023916 A023917

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Robert.Harley(AT)inria.fr, see A023902.

STATUS

approved

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Last modified January 17 11:01 EST 2022. Contains 350387 sequences. (Running on oeis4.)