%I #5 Dec 09 2007 03:00:00
%S 1,1,3,1,5,9,3,1,21,7,13,13,5
%N Trace of Frobenius of the reduction mod 2 of the elliptic curve C / L, L a lattice with Gram matrix [ 4 1; 1 2n ].
%F Of form sqrt(2^(h(1-8n)+2)-m^2(8n-1)), with m odd.
%K nonn
%O 0,3
%A Eric Rains (rains(AT)caltech.edu)