Java code to find sum of given series using recursion : 1^2 + 2^2 + 3^2 +.......+ n^2

Java program to find the sum of the following series using recursion : 1² + 2² + 3² +.......+ n²

import java.io.*;
class Series
{
 public static void main(String args[]) throws IOException
 {
 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 Series call = new Series();
 System.out.print("Enter value of n : ");
 int n = Integer.parseInt(br.readLine());
 System.out.println("Sum of series = " +call.sum(n));
 }
 int sum(int n)
 {
 if(n==1)
  return 1;
 else
  return (n*n)+sum(n-1);
 }
}

ALGORITHM:-

1. Start

2. Accept a number n from user.

3. Using method of recursion, add all the squared numbers upto n.

4. Print the sum.

5. End

OUTPUT:-

Enter value of n : 5

Sum of series = 55

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