1,1
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 399.
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=1..8.
A. Schiemann, Brandt-Intrau tables recomputed
Cf. A006377, A071136.
Sequence in context: A201101 A201105 A184614 * A121739 A166729 A202290
Adjacent sequences: A006374 A006375 A006376 * A006378 A006379 A006380
nonn,nice
N. J. A. Sloane.
approved
