209120030041domain: NAppears in sequencesNumber of (n+1)X(n+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.at n=4A205207Number of (n+1)X6 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.at n=4A205212