Number of ways of tiling the n X n torus up to 90-degree rotations of the square by a tile that is fixed only under 180-degree rotation of the square.

A368144

Number of ways of tiling the n X n torus up to 90-degree rotations of the square by a tile that is fixed only under 180-degree rotation of the square.

Terms

    a(0) =1a(1) =4a(2) =24a(3) =1155a(4) =337600a(5) =477339104

External references