Extract an expression from a sum

Question:Extract an expression from a sum

Posted: Erik Engbrecht 5 Product: Maple 14

March 11 2011

Let's say I have a summation:

$sum(a[n]*x^(n-2)*(n-1)*n, n = 0 .. infinity)$

Is there a way to extract the expression being summed?

$a[n]*x^(n-2)*(n-1)*n$

I've experimented with patmatch, but haven't been able to make it work.

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