0,5
Plesken, J. Algebra, vol. 97 (1985) pp. 286-312
J. H. Conway and N. J. A. Sloane, "Low-Dimensional Lattices II: Subgroups of GL(n,Z)", Proc. Royal Soc. London, A 419 (1988), 29-68.
G. Nebe and N. J. A. Sloane, Home page for this lattice
Sequence in context: A138826 A138720 A006064 * A204749 A144469 A009101
Adjacent sequences: A015161 A015162 A015163 * A015165 A015166 A015167
nonn
N. J. A. Sloane (njas(AT)research.att.com).