题目链接
找规律，经观察：第一项为n(n-1)+1，最后一项为n(n+1)-1，把中间的数print一下就ok

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in=new Scanner(System.in);
        while(in.hasNext()){
            int n=in.nextInt();
            int start=n*(n-1)+1;
            int end=n*(n+1)-1;
            for(int i=start;i<=end;i+=2){
                if(i==end){
                    System.out.println(i);
                }
                else
                    System.out.print(i+"+");
            }
        }
    }

}