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,


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