User blog comment:Deedlit11/tree(n) and otree(n)/@comment-10429372-20140813060008

I'm totally not sure about this, but isn't

4: ()

5: (())

6: ((())())

7: (((())()))

8: ((((()()))))

9: (((()())))

10: ((()()))

11: (()())

...

an improvement?