0,2

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p 102 eq 9.

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Michael Gilleland, Some Self-Similar Integer Sequences

Sequence in context: A033745 A033721 A033739 * A115951 A057607 A264954

Adjacent sequences: A033730 A033731 A033732 * A033734 A033735 A033736

nonn

N. J. A. Sloane

approved