4998606173domain: NAppears in sequencesNumber of (n+1) X (4+1) 0..2 arrays with every 2 X 2 subblock summing to 2, 4, or 6.at n=5A251331Number of (n+1)X(6+1) 0..2 arrays with every 2X2 subblock summing to 2 4 or 6.at n=3A251333