Function in Python that determines the Fibonacci number at 'n' index

In mathematics, the Fibonacci numbers form a sequence, the Fibonacci sequence, in which each number is the sum of the two preceding ones.

The sequence commonly starts from 0 and 1, although some authors omit the initial terms and start the sequence from 1 and 1 or from 1 and 2. 

Starting from 0 and 1, the next few values in the sequence are:

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...



# The Fibonacci number present at nth index

def fibo(n):
    if n==0:
        return 0
    elif n==1:
        return 1
    else:
        return fibo(n-1) + fibo(n-2)

n = int(input("Enter the number: "))
print(fibo(n))





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