Number of staircase polygons of perimeter 2n with one (staircase polygon) hole on square lattice (not allowing rotations).
1, 12, 94, 604, 3463, 18440, 93274, 454412, 2151673, 9964500, 45335002
1 seqfan posts
Sat Feb 14 17:48:59 CET 2009 [seqfan] Re: Staircase Polygons (with a Rotated Staircase hole) by perimeter