A008663 Theta series of direct sum of 2 copies of f.c.c. lattice.

1, 24, 156, 192, 636, 624, 1312, 1152, 2556, 1752, 4056, 2880, 5152, 4080, 7872, 4992, 10236, 6960, 11388, 8640, 16536, 9216, 19680, 12672, 20512, 15624, 26520, 15744, 30912, 20208, 34112, 23040

Offset

0,2

References

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 113.

Links

Table of n, a(n) for n=0..31.

Index entries for sequences related to f.c.c. lattice

Mathematica

terms = 32; s = 1/4 (EllipticTheta[3, 0, q]^3 + EllipticTheta[4, 0, q]^3)^2 + O[q]^(2 terms); CoefficientList[s, q^2] (* Jean-François Alcover, Jul 07 2017, from LatticeData(fcc) *)

Crossrefs

Sequence in context: A092181 A001702 A004308 * A277984 A125334 A126492

Adjacent sequences: A008660 A008661 A008662 * A008664 A008665 A008666

Keyword

nonn,easy

Author

N. J. A. Sloane.

Status

approved