Number of convex polygons of length 2n on square lattice whose left-most bottom vertex and right-most top vertex have the same x-coordinate.
1, 9, 55, 286, 1362, 6143, 26729, 113471, 473471, 1951612, 7974660, 32384127
1 seqfan posts
Thu Feb 12 12:14:04 CET 2009 [seqfan] Sequence to A141530