It's called N-th Fibonacci, and you see it here:

http://www.codewars.com/dojo/katas/522551eee9abb932420004a0

I remembered correctly, the other one only wants to have one value, while you ask for the whole array, so perhaps you'll just want to rename the kata to

Whole Fibonacci series

or something like that. Else it's a nice kata.

5 kyu?