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.

1, 2, 5, 36, 324, 7041, 233265, 16038658, 1884307184, 426645198097, 173238487743952

Offset: 1

Author

Aaron M. Balog (ambalog(AT)ucdavis.edu), Aug 07 2003

Keywords

• nonn

Comments

A valid tiling is one in which black touches black and white touches white.