Number of one-sided chessboard polyominoes with n cells (similar to but different from A001071).
2, 1, 4, 10, 36, 110, 392, 1371, 5000, 18251, 67792, 253040, 952540, 3602846
1 seqfan posts
Sun Nov 28 02:51:12 CET 2010 [seqfan] Chessboard polyominoes