C++ :

#include<iostream>
#include<iomanip>
using namespace std;
int a[21][21];
int main()
{
	int n;
	cin>>n;
	for (int i=1,k=1; i<=n; i++)
		for (int j=1; j<=i; j++,k++) a[j][i]=k%10;
	for (int i=1; i<=n; i++)
	{
		for (int j=1; j<i; j++) cout<<"  ";
		for (int j=i; j<=n; j++) cout<<setw(2)<<a[i][j];
		cout<<endl;
	}
	return 0;
}