e-mail: elisa@dsi.unifi.it, pinzani@dsi.unifi.it
Submitted: September 3, 1999; Accepted: October 14, 1999. Abstract
An elevated Schr¨ oder path
is a lattice path that uses the steps (1, 1), (1, − 1), and (2, 0), that begins and ends on the x-axis, and that remains strictly above the x-axi[r]