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%I M0219 #12 Jan 31 2022 01:31:49
%S 1,1,1,1,1,1,1,1,2,2,2,2,3,3,4,5,8,9,13,16,28,40,68,117,297,665
%N Number of n-dimensional unimodular lattice (or quadratic forms).
%D J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 49.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%Y Cf. A054907-A054909, A054911.
%K nonn,nice,hard
%O 0,9
%A _N. J. A. Sloane_
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