function y=descendants(ij)

load indices

if ij>64 & ij<257
    y=indices(ij,:);
    y1=indices(indices(ij,:),:);
    y1=y1';
    y2=indices(indices(indices(ij,:),:),:);
    y2=y2';
    y=[y y1(:)' y2(:)'];
elseif ij>256 & ij<1025
    y=indices(ij,:);
    y1=indices(indices(ij,:),:);
    y1=y1';
    y=[y y1(:)'];
elseif ij>1024 & ij<4097
    y=indices(ij,:);
else 
    y=[];
end