Number of n X n 0..4 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

A209496

Number of n X n 0..4 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

Terms

    a(0) =1a(1) =6a(2) =1938a(3) =9502354a(4) =416022303027

External references