Question: How to find sum of series step by step?

Good evening,

I am trying to solve the following sum equation:

 

sum((factorial(n)/factorial(2*n))^n, n = 1 .. infinity)

 

but I require the step-by-step solution as to how it is done, but can't seem to find that option. 

 

If anone could help me out, that would be great.

 

Kind regards,

A

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