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A008661 Theta series of direct sum of 5 copies of D_4 lattice. 1
1, 120, 5880, 150240, 2125560, 16730064, 80352480, 343550400, 1074130680, 3300009240, 8002059984, 20074327200, 41273292000, 90329139600, 165297094080, 327390278976, 549728415480, 1009882047600 (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. 119.

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Index entries for sequences related to D_4 lattice

MATHEMATICA

terms = 18; s = (1/2 (EllipticTheta[3, 0, q]^4 + EllipticTheta[4, 0, q]^4) )^5 + O[q]^(2 terms); CoefficientList[s, q^2] (* Jean-Fran├žois Alcover, Jul 08 2017 *)

CROSSREFS

Sequence in context: A221435 A229636 A282431 * A246216 A246284 A289292

Adjacent sequences:  A008658 A008659 A008660 * A008662 A008663 A008664

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 25 19:00 EST 2022. Contains 350572 sequences. (Running on oeis4.)