Write a program in Java to find the sum of the given series:

S = 1 + 2² / a + 3³ / a² + …… to n terms

import java.util.Scanner;

public class KboatSeries
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a: ");
        int a = in.nextInt();
        System.out.print("Enter n: ");
        int n = in.nextInt();
        double sum = 0;
        for (int i = 1; i <= n; i++)
            sum += Math.pow(i, i) / Math.pow(a, i - 1);
        System.out.println("Sum = " + sum);
    }
}