177646290domain: NAppears in sequencesNumber of (n+1)X(1+1) 0..3 arrays colored with the difference of the upper median and the minimum in each 2X2 subblock.at n=6A236083T(n,k)=Number of (n+1)X(k+1) 0..3 arrays colored with the difference of the upper median and the minimum in each 2X2 subblock.at n=21A236087