I don't know how to code this number triangle

How to Code this following number triangle below??

Answer 1

[KSSV]

n = [1 11 111 1111 11111 111111 1111111];
for i = 1 : length(n)
    x = num2str(n(i)^2);
    s = [blanks(length(n)-i) x];
    fprintf('%s\n',s)
end

      1
     121
    12321
   1234321
  123454321
 12345654321
1234567654321