Help with polygamma function

[rman144]

So I've been working on a proof and Wolfram Alpha gives the following partial sum formula for one of the summations in the proof:

http://www.wolframalpha.com/input/?i=sum%5Be%5E%28-%282k%2B1%29%2Fx%29%2F%281%2Be%5E%28-%282k%2B1%29%2Fx%29+%29%5E2+%5D

What does the terminology involving psi mean? I think it is the first derivative of the polygamma function, but I don't understand what the subscript e^(2/x) means.

Thanks in advance for the help.

[CRGreathouse]

I don't know what that subscript means either. It's funny that W|A thinks that it needs to tell you what the natural logarithm is but not the (variant of the) trigamma function.