778858637315domain: NAppears in sequencesNumber of (n+1)X5 0..2 arrays with each element of every 2X2 subblock being the sum mod 3 of two others.at n=7A183831Number of (n+1)X9 0..2 arrays with each element of every 2X2 subblock being the sum mod 3 of two others.at n=3A183835