64280495958domain: NAppears in sequencesHalf the number of (n+1) X 6 0..3 arrays with every 2 X 2 subblock diagonal sum differing from its antidiagonal sum by more than 3.at n=5A184227Half the number of (n+1)X7 0..3 arrays with every 2X2 subblock diagonal sum differing from its antidiagonal sum by more than 3.at n=4A184228