582030405domain: NAppears in sequencesNumber of (n+1)X(1+1) 0..3 arrays colored with the upper median plus the lower median minus the minimum of every 2X2 subblock.at n=6A236195T(n,k) = Number of (n+1) X (k+1) 0..3 arrays colored with the upper median plus the lower median minus the minimum of every 2 X 2 subblock.at n=21A236198