title: Finding recursive equation by algorithm
body: <p>I want some help in this algorithm</p>
  
  <pre><code>int two(int n)
  {
     int sum = 0;
     int i;
     if n == 0
        return 7;
     for(i = 0; i &lt;= n-1; i++)
        sum += two(i);
     return sum;
  }
  </code></pre>
  
  <p>I try to find the recursive equation but i don't know how.
  Any idea??</p>