45791699846domain: NAppears in sequencesNumber of (n+1)X(n+1) 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.at n=4A204222Number of (n+1) X 6 0..2 arrays with the sums of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=4A204227