1980856064domain: NAppears in sequencesNumber of n X n 0..3 arrays avoiding the pattern z-1 z-1 z in any row or column.at n=3A207051Number of nX4 0..3 arrays avoiding the pattern z-1 z-1 z in any row or column.at n=3A207053T(n,k)=Number of nXk 0..3 arrays avoiding the pattern z-1 z-1 z in any row or column.at n=24A207057