I have never flown a BAE 146. On my upcoming flights the seatmap for this 146-100 on IAD-RDU has missing seats in rows 4 and 14 on the seatmap that comes up for seat selection. They are 1+2 rather than 2+3.

Does that mean that you really have a missing seats there? I.e. rows 5 and 15 are very good.

There is no indication on the regular seatmap that there are any missing seats as on the 737. Also, this version only has 16 rows and row 1 not available.