832374135domain: NAppears in sequencesHalf the number of (n+1)X6 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.at n=5A209508Half the number of (n+1)X7 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.at n=4A209509