9808052813domain: NAppears in sequencesNumber of (n+1)X(n+1) 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=5A183846Number of (n+1)X7 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=5A183851