Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its horizontal and vertical neighbors by one or two.

A265443

Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its horizontal and vertical neighbors by one or two.

Terms

    a(0) =2a(1) =53a(2) =2825a(3) =57721a(4) =744805a(5) =19827238a(6) =901139380a(7) =27582975041a(8) =585047767454

External references