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Number of n-dimensional odd unimodular lattice (or quadratic forms) containing no vectors of norm 1.
2

%I #7 Oct 11 2014 02:12:03

%S 0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,1,1,4,3,12,12,28,49,156,368

%N Number of n-dimensional odd unimodular lattice (or quadratic forms) containing no vectors of norm 1.

%D J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 49.

%Y Cf. A005134, A054907-A054909, A054911.

%K nonn,nice,more,hard

%O 0,19

%A _N. J. A. Sloane_, May 23 2000