Search: id:A054909
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%I A054909
%S A054909 1,1,2,24
%N A054909 Number of 8n-dimensional even unimodular lattice (or quadratic forms).
%D A054909 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", 
               Springer-Verlag, p. 49.
%H A054909 S. R. Finch, <a href="http://algo.inria.fr/bsolve/">Minkowski-Siegel 
               mass constants</a>
%Y A054909 Cf. A005134, A054907, A054908, A054911.
%Y A054909 Sequence in context: A089987 A162605 A118812 this_sequence A100816 A079612 
               A066585
%Y A054909 Adjacent sequences: A054906 A054907 A054908 this_sequence A054910 A054911 
               A054912
%K A054909 nonn,nice,hard,bref
%O A054909 0,3
%A A054909 N. J. A. Sloane (njas(AT)research.att.com), May 23 2000
%E A054909 The classical mass formula shows that the next term is at least 8*10^7.
%E A054909 Oliver King and Richard Borcherds (reb(AT)math.berkeley.edu) have recently 
               improved this estimate and have shown that a(4), the number in dimension 
               32, is at least 10^9 (Jul 22, 2000)

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