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Question: Not solving when specifying value of n?

Question:Not solving when specifying value of n?

leafgreen 40 Maple
syntax evaluation
December 14 2016
1

This is what I'm trying to solve:

I literally just want it to plug in those values for n and spit out a value. This is easy enough for me to do by hand, but I obviously wanted to speed up the process by doing it with Maple. What's wrong here? I clicked the pink links and that didn't help.
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