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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 157.
E. C. Pervin, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=0..10.
Sequence in context: A066270 A236981 A203724 * A178270 A183751 A231954
Adjacent sequences: A006912 A006913 A006914 * A006916 A006917 A006918
N. J. A. Sloane.