270817218domain: NAppears in sequencesNumber of (n+1)X(3+1) 0..3 arrays colored with the maximum plus the upper median plus the lower median of every 2X2 subblock.at n=2A236253T(n,k)=Number of (n+1)X(k+1) 0..3 arrays colored with the maximum plus the upper median plus the lower median of every 2X2 subblock.at n=12A236254