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A008449 Theta series of A_9 lattice. 4
1, 90, 1260, 4920, 13320, 30492, 55860, 94680, 156240, 232770, 332640, 471240, 636480, 835020, 1098900, 1391040, 1720800, 2181780, 2614260, 3118680, 3889962, 4519140, 5207760, 6237000 (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..23.

MATHEMATICA

terms = 24; f[q_] = LatticeData["A9", "ThetaSeriesFunction"][-I Log[q]/Pi]; Series[f[q], {q, 0, 2 terms - 1}] // CoefficientList[#, q]& // Round // DeleteCases[#, 0]& (* Jean-Fran├žois Alcover, Jul 04 2017 *)

CROSSREFS

Sequence in context: A013425 A013428 A013429 * A213455 A155016 A179800

Adjacent sequences:  A008446 A008447 A008448 * A008450 A008451 A008452

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 21 20:51 EDT 2018. Contains 316428 sequences. (Running on oeis4.)