Generates a list of the specified number of Fibonacci numbers
The Fibonacci sequence is: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34,...
That is, item 0 is 0, item 1 is 1, and the subsequent item is the sum of the first two items.
The general term formula of Fibonacci series is:
F(n) = F(n-1) + F(n-2)