Driver Code
$ n = 5 ; echo $ n , " th ▁ centered ▁ decagonal " , " number : ▁ " ; echo centereddecagonalnum ( $ n ) ; echo " STRNEWLINE " ; $ n = 9 ; echo $ n , " th ▁ centered ▁ decagonal " , " number : ▁ " ; echo centereddecagonalnum ( $ n ) ; ? >