How to find all accumulation points of a sequence

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First of all, I had I apology for snipping the equation out from my worksheet instead of writing it down. I'm new here.

sequence I need to find all accumulation points

I tried to solve it by hand, by substituting some numbers for n, but I was unable to find any pattern. Therefore, I decided to enter this on graphing calculator, hoping the graph makes it easier to find its accumulation points. However, I'm not sure why, but my graph didn't show any graph. I also tried putting it in online graphing calculator on google, and it said the bound is out of range.

Therefore, I 'm really stuck now. Not sure what to do, what else I can try.

Any help would be appreciated.

Thank you!