pattern16.java

import java.util.*;

public class pattern16{

public static void main(String[] args) {
    Scanner scn = new Scanner(System.in);

     int n = scn.nextInt();
     
     int sp = 2*n - 3;
     int st = 1;
     
     for(int i = 1;i<=n;i++){
        int val = 1;
        for(int j = 1;j<=st;j++){
            System.out.print(val + "\t");
                val++;
        }
        for(int j = 1;j<=sp;j++){
            System.out.print("\t");
        }
        
        if(i == n){
            st--;
            val--;
        }
        for(int j = 1;j<=st;j++){
            val--;
            System.out.print(val + "\t");
          
        }
        st++;
        sp-=2;
        System.out.println();
        
     }
     
 }
}

/*

input = 5;
output : 
1								1	
1	2						2	1	
1	2	3				3	2	1	
1	2	3	4		4	3	2	1	
1	2	3	4	5	4	3	2	1	
*/