A022044 - OEIS

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A022044

Theta series of D_13 lattice.

1, 312, 11466, 116688, 535704, 1899664, 5043376, 12066912, 24443978, 48210760, 83323344, 145532816, 227110416, 363737712, 531517376, 800145632, 1104376728, 1594656544, 2114015514, 2931991920, 3779027408, 5091783840, 6365016528, 8409556064, 10285042352, 13266026280, 15994749968

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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..10000

MATHEMATICA

terms = 20; f[q_] = LatticeData["D13", "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: A233934 A289793 A364992 * A156403 A296527 A107508

Adjacent sequences: A022041 A022042 A022043 * A022045 A022046 A022047

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Seiichi Manyama, Oct 16 2018

STATUS

approved