%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