0,3

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 161.

1+180*q^4+416*q^6+...

Sequence in context: A095650 A066164 A008891 this_sequence A154361 A004532 A143793

Adjacent sequences: A015230 A015231 A015232 this_sequence A015234 A015235 A015236

nonn

N. J. A. Sloane (njas(AT)research.att.com).