OFFSET
0,5
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 114.
LINKS
Kok Seng Chua, The Root Lattice A*n and Ramanujan's Circular Summation of Theta Functions, Proc. Amer. Math. Soc. 130 (2002), 1-8.
G. Nebe and N. J. A. Sloane, Home page for this lattice
FORMULA
E4(9z)+18*eta^12(9z)/eta^4(3z) (E4(9z) term because A*_8 contains E8 as a sublattice). - Kok Seng Chua, May 02 2000
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Kok Seng Chua, Jul 29 2001
STATUS
approved