2373353909domain: NAppears in sequencesNumber of (n+1)X5 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=7A183849Number of (n+1)X9 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others.at n=3A183853