13642432110domain: 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=6A209508Half the number of (n+1)X8 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.at n=4A209510