As for the B205, A1 and B's you will go from 30001 to 30352 or 54. I flew the last B205A1 ever made, (German registered aircraft) but can't remember if the serial number finished by 30352 or 54.
Also I believe that 4 of those serial#'s are B205B.
Bell's website should be able to help you with this.
JD