composite magic number

public class MagicNumber {
    public static void main(String[] args) {
        int x = magicNumber(10);
        System.out.println(x);
    }
    public static int magicNumber(int number) {
        if (number == 1) {
            return 1;
        } else {
            return 2 * magicNumber(number - 1) + 3;
        }
    }
}