A022053 - OEIS

A022053

Theta series of D_22 lattice.

1, 924, 117084, 4812192, 86075484, 815677016, 5012882336, 23460347328, 89096422492, 289559673084, 830202403800, 2153312518240, 5140361517984, 11444537517336, 24015334687168, 47873378766400, 91281903219804, 167369436673208, 296418599695548, 509007239863584

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OFFSET

0,2

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

MATHEMATICA

terms = 17; f[q_] = LatticeData["D22", "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 *)

CROSSREFS

Sequence in context: A283577 A361608 A177304 * A107517 A140906 A179715

Adjacent sequences: A022050 A022051 A022052 * A022054 A022055 A022056

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Seiichi Manyama, Oct 16 2018

STATUS

approved