910532241954domain: NAppears in sequencesHalf the number of (n+1)X4 0..2 arrays with every 2X2 subblock having two or three distinct clockwise edge differences.at n=5A210271Half the number of (n+1)X7 0..2 arrays with every 2X2 subblock having two or three distinct clockwise edge differences.at n=2A210274