View Box 330 Seating Chart
There are 24 seats in Section 330, Row A at AT&T Park in San Francisco. As you look towards the field from those seats, seat number 1 is on the right aisle. You'll enter the section from the concourse between Row D and Row 1 and then walk down four steps to Row A at the front of the section.
Row A Seat View
The sitelines from Row A in the View Level are somewhat obstructed by the railing that protects fans in the upper deck, though views of the harbor from Section 330 are very good.
Tips on avoiding obstructed/limited views in the upper deck can be found in response to this question about the limited view designation.