1475983975domain: NAppears in sequencesNumber of (n+1)X(3+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal.at n=6A236741Number of (n+1)X(7+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal.at n=2A236745