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Feb 2, 2011 at 10:29 comment added François Brunault To add to Ira's answer, Petersen's proof counted paths on the vertices of a regular polygon. The (equivalent) proof counting bijections of $\mathbf{Z}/p\mathbf{Z}$ was given by Dickson himself (Annals of Math (1), 11, 1896-7, 120).
Feb 2, 2011 at 5:11 vote accept David Feldman
Feb 2, 2011 at 3:48 history answered Ira Gessel CC BY-SA 2.5