33137271domain: NAppears in sequencesHalf the number of (n+1) X 5 0..2 arrays with every 2 X 2 subblock having two or four distinct clockwise edge differences.at n=5A209507Half the number of (n+1)X7 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.at n=3A209509