Question

I need to get this entire thing to print out in the center, but it could be between 1 to 15 rows, so i can't really hardcode, here is an example of the max, i need all the same numbers to line up in the center.

1
212
32123
4321234
543212345
65432123456
7654321234567
876543212345678
98765432123456789
109876543212345678910
1110987654321234567891011
12111098765432123456789101112
131211109876543212345678910111213
1413121110987654321234567891011121314
15141312111098765432123456789101112131415