A086832 - OEIS

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.

%I #1 Sep 13 2003 03:00:00

%S 1,2,5,36,324,7041,233265,16038658,1884307184,426645198097,

%T 173238487743952

%N 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.

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

%K nonn

%O 1,2

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