28500435385domain: NAppears in sequencesNumber of (n+1)X(4+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock equal.at n=5A236733Number of (n+1)X(6+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock equal.at n=3A236735