Number of (2n-1)X4 0..8n-5 arrays with upper left zero and lower right 8n-5 and each element differing from its horizontal and vertical neighbors by a power of three.

A265215

Number of (2n-1)X4 0..8n-5 arrays with upper left zero and lower right 8n-5 and each element differing from its horizontal and vertical neighbors by a power of three.