0,12
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 114.
Sequence in context: A145319 A089626 A110479 * A022076 A055766 A036204
Adjacent sequences: A023931 A023932 A023933 * A023935 A023936 A023937
nonn
N. J. A. Sloane (njas(AT)research.att.com).