0,5
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 120.
Sequence in context: A122500 A116197 A023924 this_sequence A040681 A040682 A040683
Adjacent sequences: A022063 A022064 A022065 this_sequence A022067 A022068 A022069
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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