title: Indirect formula to look up range of tabs
body: <p>I am having trouble getting my indirect formula to work on a range of tabs.
  I have 6 tabs between <code>IW</code> and <code>MP</code> which I want to sum up all of the cell <code>F23</code>s. I would like to have <code>IW:MP</code> (the range of tabs) in cell <code>F11</code> and indirectly refer to it.
  So instead of having <code>=sum(IW:MP!F23)</code>, I would have <code>=sum(indirect(f11&amp;&quot;!f23&quot;))</code> but I can't get it to work. Any help is appreciated!</p>