0,5
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 120.
Sequence in context: A008891 A015233 A154361 this_sequence A143793 A032774 A032776
Adjacent sequences: A004529 A004530 A004531 this_sequence A004533 A004534 A004535
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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