>> The original function is f(x) = M*R*(D^x), where M, R and D are 
>> constants.
>>
>> I'd be using the function g(A) = sum of f(x), where x=0..A

In open office the seriessum function comes close to what you want.
http://wiki.services.openoffice.org/wiki/Documentation/How_Tos/Calc:_SERIESSUM_function
I don't think spreadsheets have a way to pass a function as a
first class value though, you could write some basic macro but
that's what you want to avoid.

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