Recursive Method Output

What is printed when the following code is executed?

public class WeirdCalc {
    public static int calc(int n) {
        if(n == 1)
            return 2;
        return calc(n - 1) * 2 + 1;
    }
    public static void main(String[] args) {
        System.out.println(calc(4));
    }
}