1,4

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P. M. Gruber, Convex and Discrete Geometry, Springer, 2007; p. 439

J. H. Conway and N. J. A. Sloane, Sphere Packings, Lattices and Groups, Springer-Verlag, 3rd edition, 1999, see Preface to 3rd Ed., especially the page that was omitted by the publisher between pages xx and xxi!

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Cf. A004026.

Sequence in context: A002234 A074005 A082611 this_sequence A018324 A129379 A000308

Adjacent sequences: A033686 A033687 A033688 this_sequence A033690 A033691 A033692

nonn,nice,hard

njas

a(8) = 2408 was calculated by G. Nebe's student Cordian Riener - communicated by G. Nebe, Oct 11, 2005. He found this number by checking the complete list of 10916 perfect lattices in 8 dimensions (see A004026).