NOT THE EXACT CODE BUT YOU CAN TAKE HELP FROM THIS !
import java.util.*;
class Main
{
public static void main(String args[])
{
int i,j,n,k=1;
Scanner sc = new Scanner(System.in);
System.out.println("Enter the no of lines");
n=sc.nextInt();
for(i=1;i<=n;i++)
{
k = (i*(i+1))/2;
for(j=1;j<=i;j++)
{
System.out.printf("%3d",k);
k--;
}
System.out.println();
}
}
}