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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 140.
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: A045215 A194085 A216114 * A281779 A231804 A093250
Adjacent sequences: A005951 A005952 A005953 * A005955 A005956 A005957
N. J. A. Sloane.