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A005134 Number of n-dimensional unimodular lattice (or quadratic forms).
(Formerly M0219)
4

%I M0219

%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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Last modified November 20 14:28 EST 2018. Contains 317402 sequences. (Running on oeis4.)