Given n (always odd), return output a that has concentric rings of the 69s and 0s around the center point. Examples:

 Input  n = 3
 Output a is [     69    69    69
                   69     0    69
                   69    69    69 ]

 Input  n = 5
 Output a is [   0     0     0     0     0
                 0    69    69    69     0
                 0    69     0    69     0
                 0    69    69    69     0
                 0     0     0     0     0]