This functions receives a number n and returns the nth number in the fibonacci series.
This functions receives a number `n` and returns the nth number in the fibonacci series.
The Fibonacci Series starts like this: 0, 1, 1, 2, 3, 5, 8, 13... so fibonacci(2) = 1 and fibonnacci(4) = 3
The Fibonacci Series starts like this: 0, 1, 1, 2, 3, 5, 8, 13 etc...
Each number in the series is calculated by the summing of the two previous ones (With the exception of the two first ones which are defined as 0 and 1).