[C#] Домашно Loops – 12 задача

Write a program that reads from the console a positive integer number N (N < 20) and outputs a matrix like the following:
N = 3
———
1 2 3
2 3 4
3 4 5

N = 4
———
1 2 3 4
2 3 4 5
3 4 5 6
4 5 6 7