Nth Even Fibonacci Number Java

PROGRAM TO FIND THE N'TH EVEN FIBBONACCI NUMBER.



class MAIN {
   
    // Function which return 
    // nth even fibonnaci number 
    static long evenFib(int 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
    public static void main (String[] args)
    {
        int n = 7;
        System.out.println(evenFib(n)); 
    }
}

OUTPUT
10946

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