In Section 8 rows 1-18, there are a total of 18 seats in each row, with seat 1 being on the aisle to the right of the section as you face the court. In row 19W (the last row in the section and reserved for handicap accessible seating), there are a total 12 seats.

Typical Seating Layout in Section 8 at Barclays Center
Most seating rows in Section 8 feature 18 seats, with Seat 1 at the right as you face the floor