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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 114.
Table of n, a(n) for n=0..40.
Sequence in context: A220350 A171705 A228426 * A022070 A123301 A037933
Adjacent sequences: A023925 A023926 A023927 * A023929 A023930 A023931
N. J. A. Sloane.