28644905324domain: NAppears in sequencesNumber of n X 3 0..3 arrays avoiding the pattern z-1 z-1 z in any row or column.at n=5A207052Number of nX6 0..3 arrays avoiding the pattern z-1 z-1 z in any row or column.at n=2A207055T(n,k)=Number of nXk 0..3 arrays avoiding the pattern z-1 z-1 z in any row or column.at n=30A207057