203797267488domain: NAppears in sequencesNumber of (n+1)X(4+1) 0..3 arrays with every 2X2 subblock summing to 3 6 or 9.at n=6A251296Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock summing to 3 6 or 9.at n=3A251299