25468475domain: NAppears in sequencesNumber of (n+1)X(n+1) binary arrays with each element of every 2X2 subblock being the sum mod 2 of two others.at n=4A183837Number of (n+1) X 6 binary arrays with each element of every 2X2 subblock being the sum mod 2 of two others.at n=4A183841