0,2
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag.
Table of n, a(n) for n=0..5.
Sequence in context: A304177 A306834 A109271 * A022420 A326741 A034811
Adjacent sequences: A029752 A029753 A029754 * A029756 A029757 A029758
nonn,hard
N. J. A. Sloane.
approved