Distinct numbers seen when writing first numerator and then denominator of central elements of 1/2-Pascal triangle.
1, 2, 3, 11, 40, 147, 546, 2046, 7722, 29315, 111826, 428298, 1646008, 6344366
1 seqfan posts
Tue Sep 13 03:59:00 CEST 2011 [seqfan] Flat steps in Schroeder paths that are not the first step