write a code to print numbers in spiral pattern in c without arrays

I need to write a code to print spiral pattern in c without arrays; but I'm really stuck.

input 3:
output:
1 2 3
8 9 4
7 6 5
input 4:
output:
1  2  3  4
12 13 14 5
11 16 15 6
10 9  8  7

any suggestions?