8412540domain: NAppears in sequencesNumber of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median minus the lower median of every 2X2 subblock equal.at n=6A237392T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum plus the upper median minus the lower median of every 2X2 subblock equal.at n=21A237398