T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with every 2 X 2 subblock having three or four distinct values, and new values 0..3 introduced in row major order.

A210413

T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with every 2 X 2 subblock having three or four distinct values, and new values 0..3 introduced in row major order.