0,1
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 511.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Sequence in context: A027567 A033475 A053060 * A134164 A098209 A174755
Adjacent sequences: A004031 A004032 A004033 * A004035 A004036 A004037
nonn
N. J. A. Sloane (njas(AT)research.att.com).