% 20-queens:
% 16 7 12 10 8 20 4 19 11 6 18 13 17 14 9 15 2 5 3 1 
%
q = [16, 7, 12, 10, 8, 20, 4, 19, 11, 6, 18, 13, 17, 14, 9, 15, 2, 5, 3, 1];
----------