81224020domain: NAppears in sequencesNumber of (n+1) X (3+1) 0..3 arrays colored with the sum of the upper and lower median values of each 2 X 2 subblock.at n=2A236656T(n,k)=Number of (n+1)X(k+1) 0..3 arrays colored with the sum of the upper and lower median values of each 2X2 subblock.at n=12A236657