OFFSET
0,5
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 120.
LINKS
Andy Huchala, Table of n, a(n) for n = 0..2500
G. Nebe and N. J. A. Sloane, Home page for this lattice
EXAMPLE
G.f. = 1 + 22*q^4 + 220*q^8 + ...
PROG
(Magma)
L := Dual(Lattice("D", 11));
B := Basis(ThetaSeriesModularFormSpace(L), 20);
S := [1, 0, 0, 0, 22, 0, 0];
Coefficients(&+[B[i] * S[i] : i in [1..6]]); // Andy Huchala, Jul 13 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved