2848572domain: NAppears in sequencesNumber of (n+1)X(3+1) 0..3 arrays with the upper median equal to the lower median in every 2X2 subblock.at n=2A235852T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median equal to the lower median in every 2X2 subblock.at n=12A235856