Number of (2n-1)X6 0..12n-7 arrays with upper left zero and lower right 12n-7 and each element differing from its horizontal and vertical neighbors by a power of three.

A265217

Number of (2n-1)X6 0..12n-7 arrays with upper left zero and lower right 12n-7 and each element differing from its horizontal and vertical neighbors by a power of three.