0,13
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 114.
Sequence in context: A134725 A203499 A013843 * A015066 A022078 A174914
Adjacent sequences: A023933 A023934 A023935 * A023937 A023938 A023939
nonn
N. J. A. Sloane (njas(AT)research.att.com).