specific fourier call

Hi all,

This is very embarrassment, but I have used some years ago this type  
of function call:

" Arima(trend + max(seasonal), order=c(2,0,1), xreg=fourier(1:n,c*2,m))"

Unfortunately, now I'm not able to find the suitable library where  
this specific fourier-call is implemented. Can you help me to find it?

Thanks for your help,
Jari