65461226domain: NAppears in sequencesNumber of (n+1)X4 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=7A183848Number of (n+1)X9 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=2A183853