Driver Code
$ n = 2 ; echo $ n , " th ▁ centered ▁ hexadecagonal ▁ number ▁ : ▁ " , center_hexadecagonal_num ( $ n ) ; echo " STRNEWLINE " ; $ n = 12 ; echo $ n , " th ▁ centered ▁ hexadecagonal ▁ numbe ▁ : ▁ " , center_hexadecagonal_num ( $ n ) ; ? >