0,2
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p 102 eq 9.
Michael Gilleland, Some Self-Similar Integer Sequences
Sequence in context: A033745 A033721 A033739 this_sequence A115951 A057607 A139213
Adjacent sequences: A033730 A033731 A033732 this_sequence A033734 A033735 A033736
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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