** can't open indented results
   :PROPERTIES:
   :DATE:     2010-06-11
   :END:

   #+begin_src latex :packages '(("" "tikz") ("active,tightpage" "preview")) :file recursion.pdf
     \begin{preview}
     \ovalbox{
     \begin{tikzpicture}
     \node{$n$}
       child {
         node{$\left(\frac{n}{2}\right)^2$}
           child{
             node{$\left(\frac{n}{4}\right)^2$}
             node{$\left(\frac{n}{4}\right)^2$}
           }
         }
       child{
         node{$\left(\frac{n}{2}\right)^2$}
         child{
           node{$\left(\frac{n}{4}\right)^2$}
           node{$\left(\frac{n}{4}\right)^2$}
         }
       };
     \end{tikzpicture}
     }
     \end{preview}
   #+end_src

   #+name:
   [[file:recursion.pdf]]