231988508domain: NAppears in sequencesHalf the number of (n+1)X4 0..3 arrays with every 2X2 subblock diagonal sum differing from its antidiagonal sum by more than 3.at n=6A184225Half the number of (n+1)X8 0..3 arrays with every 2X2 subblock diagonal sum differing from its antidiagonal sum by more than 3.at n=2A184229