Number of ways to tile an n X n board having a black border with the following 1 X 1 tiles: bbbb, bbww, wbbw, bwwb, wwbb, where the colors are read clockwise around each tile.

A086832

Number of ways to tile an n X n board having a black border with the following 1 X 1 tiles: bbbb, bbww, wbbw, bwwb, wwbb, where the colors are read clockwise around each tile.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =36a(4) =324a(5) =7041a(6) =233265a(7) =16038658a(8) =1884307184a(9) =426645198097

External references