In [3]: Trees(10)
Out[3]: 
[0, 1, 1, 4, 25, 220, 2485, 34300, 559405, 10525900]

In [4]: Trees_ordered(10)
Out[4]: 
[0, 1, 1, 3, 10, 38, 154, 654, 2871, 12925]
