181527680767domain: NAppears in sequencesNumber of (n+1)X7 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=6A183851Number of (n+1)X8 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=5A183852