I'm trying to plot some expressions the contain infinite summations.  On some of them it is working, but is really slow, and on others Maple keeps thinking and consuming more memory until it reaches just under 2 gb, by which time it is pretty much hung.

Is there a way make Maple not work so hard in evaluating the summations?

I'm using Maple 14 on OSX 10.5.8.  I have a lot of expressions that look like this:

(which doesn't seem to be rendering here...so in 1D form)

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

My problem is the when using default fonts and 100% zoom the plus signs in the subscripts aren't...

Let's say I have a summation:

Is there a way to extract the expression being summed?

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