4200572147domain: NAppears in sequencesNumber of (n+1)X(n+1) 0..2 arrays with each element of every 2X2 subblock being the sum mod 3 of two others.at n=4A183828Number of (n+1)X6 0..2 arrays with each element of every 2X2 subblock being the sum mod 3 of two others.at n=4A183832