A PDF file entitled "Summary of IR Protocols to be Used for 3rd Party Remote Control Manufacturers" provided by Lutron. Includes infrared protocol information and Pronto-format hex codes.
I was having trouble with learned codes downloaded here, but these straightened everything out. Even had more codes (just one for my application) than what the OEM remote had.
Spacer system preset codes for the 4 button Lutron remote. Also includes OFF and UP & DOWN codes. Use presets to set 4 scenes (set levels, press and hold a preset until dimmers flash three times).