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A022073
Theta series of D*_20 lattice.
1
1, 40, 760, 9120, 77560, 1546224, 2508000, 31204160, 34729720, 300136200, 259114704, 1823305440, 1327461600, 8216920880, 5341699520, 29758804416, 17701924600, 91800254160, 51294999960, 249835104800, 131880275664, 614963569920, 312126610080, 1394448792000
OFFSET
0,2
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 120.
LINKS
EXAMPLE
G.f. = 1 + 40*q^2 + 760*q^4 + ...
PROG
(Sage)
L = [ 1, 40, 760]
M = ModularForms(Gamma0(2), 10)
bases = [_.q_expansion(20) for _ in M.integral_basis()]
f = sum(x*y for (x, y) in zip(bases, L)); list(f) # Andy Huchala, Jul 14 2021
CROSSREFS
Sequence in context: A233725 A175603 A319308 * A261571 A010956 A006240
KEYWORD
nonn
EXTENSIONS
More terms from Andy Huchala, Jul 14 2021
STATUS
approved