Even searching for " ['number of trees' leaves][1] " didn't reveal what I am looking for: an approach for calculating the (approximate) number of trees with exactly n nodes and m leaves. Any hints from MO?


  [1]: http://www.research.att.com/~njas/sequences/?q=%2522number+of+trees%2522+leaves&sort=0&fmt=0&language=english&go=Search