Nth Even Fibonacci Number Python

PROGRAM TO FIND THE N'TH EVEN FIBBONACCI NUMBER.


def evenFib(n) :
    if (n < 1) :
        return n
    if (n == 1)  :
        return 2
   
    # calculation of 
    # Fn = 4*(Fn-1) + Fn-2
    return ((4 * evenFib(n-1)) + evenFib(n-2))  
  
  
# Driver Code 
n = 7
print(evenFib(n))


OUTPUT
10946

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