3428713825domain: NAppears in sequencesNumber of (n+1)X4 0..3 arrays with every 2X2 subblock having two distinct values, and new values 0..3 introduced in row major order.at n=6A209809Number of (n+1)X8 0..3 arrays with every 2X2 subblock having two distinct values, and new values 0..3 introduced in row major order.at n=2A209813