// output of ./demo/comb/ordered-tree-branching-seq-demo.cc: // Description: //% Branching sequences for ordered rooted trees: //% words [s(0), s(1), ..., s(n)] with s(n)=0, sum(j=0..n, s(j)) = n, //% sum(j=0..k, s(j)-1 ) >= 0 for k