Eighteen Draco thrusters are used on the Dragon spacecraft for attitude control and maneuvering. Dual-redundant in all axes: any two can fail and still have complete vehicle control in pitch, yaw, roll and translation.
Four Draco thrusters are used on the Falcon 9 second-stage as a reaction control system.
I've looked at some pictures, and I think a thruster "pod" is a collection of 4 thrusters, all pointing in different directions. It looks like there are 4 such pods arranged around the edge of the Dragon capsule. That would account for 16 or the 18 thrusters.
Two of the pods have 5 thrusters. Those pods have two thrusters point "up". That give a total of six pointing "up". These are the thrusters used for the deorbit burn and having two extra is for redundancy
Eighteen Draco thrusters are used on the Dragon spacecraft for attitude control and maneuvering. Dual-redundant in all axes: any two can fail and still have complete vehicle control in pitch, yaw, roll and translation.
Four Draco thrusters are used on the Falcon 9 second-stage as a reaction control system.