That works for two-row radials; this is a four-row, which means:
(360 / 7) / 4 = 12.857142° cylinder angular difference from row-to-row.
The crankshaft throws are also rotated to compensate for the cylinder rotation, with each successive throw, aft to fore, being 192.857142° clockwise from the last.
Cylinder numbering, firing order and other details can be found at
P&W R-4360