21249328546domain: NAppears in sequencesNumber of (n+1)X(3+1) 0..3 arrays colored with the difference of the upper median and the lower median in each 2X2 subblock.at n=4A236039T(n,k)=Number of (n+1)X(k+1) 0..3 arrays colored with the difference of the upper median and the lower median in each 2X2 subblock.at n=23A236041