The number of ways of tiling the n X n grid up to 90-degree rotation by a tile that is fixed under 180-degree rotation but not 90-degree rotation.

A367531

The number of ways of tiling the n X n grid up to 90-degree rotation by a tile that is fixed under 180-degree rotation but not 90-degree rotation.

Terms

    a(0) =1a(1) =6a(2) =136a(3) =16456a(4) =8390656a(5) =17179934976

External references