change column number in A1 reference based on formula.

I want to refer to the row number of a column based on a formula.  Is there a way to refer to a cell where the row number changes using a formula, even though I'm using the A1 style of referencing?  Or would I have to change to R1C1 style?  

For instance, within a formula, I need to refer to a cell in column F, but the cell I need to refer to changes based on a counta() fn.  For instance, the formula might be something like =SUM(Fx:F25) where x= counta(C1:C10).  

I'm just blanking out on this, and I'm sure the answer is probably simple.  Thanks for your help.
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barry houdiniCommented:
You can use INDEX function, e,g,


regards, barry

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witzph1Author Commented:
Perfect.  I had used the INDEX "array form", but not the "reference form."  I had forgotten about the reference form.  Thanks for the help.
witzph1Author Commented:
Thanks so much.
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