19537398722domain: NAppears in sequencesHalf the number of (n+1)X3 0..2 arrays with every 2X2 subblock having two or three distinct clockwise edge differences.at n=6A210270Half the number of (n+1)X8 0..2 arrays with every 2X2 subblock having two or three distinct clockwise edge differences.at n=1A210275