1,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

J. W. S. Cassels, An Introduction to the Geometry of Numbers. Springer-Verlag, NY, 2nd ed., 1971, p. 332.

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 20.

P. M. Gruber and C. G. Lekkerkerker, Geometry of Numbers, North-Holland, Amsterdam, 2nd ed., 1987, p. 410.

H. Cohn and A. Kumar, Optimality and uniqueness of the Leech lattice among lattices

H. Cohn and A. Kumar, The densest lattice in twenty-four dimensions

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

1, 4/3, 2, 4, 8, 64/3, 64, 256, ... = A007361/A007362

Cf. A007361.

Sequence in context: A068153 A039993 A075053 this_sequence A060268 A030328 A093148

Adjacent sequences: A007359 A007360 A007361 this_sequence A007363 A007364 A007365

nonn,hard,nice,frac

N. J. A. Sloane (njas(AT)research.att.com).

From the work of Cohn and Kumar we know that a(24) = 1.