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Number of "escalator" lattices in dimension n.
0

%I #5 Mar 18 2016 15:07:23

%S 1,1,2,9,207,1632,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

%N Number of "escalator" lattices in dimension n.

%D Manjul Bhargava, lecture on Universal Forms, AMS Annual Meeting, Phoenix, AZ, Jan 08 2004.

%H Manjul Bhargava , On the Conway-Schneeberger fifteen theorem, pp. 27-38, in: <a href="http://www.maths.ed.ac.uk/~aar/books/dublin.pdf">Quadratic Forms and Their Applications</a>, 1999.

%F Zero for n >= 6.

%K nonn,easy

%O 0,3

%A _N. J. A. Sloane_, Feb 16 2006