78298719958domain: NAppears in sequencesHalf the number of (n+1)X3 0..3 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.at n=6A209907Half the number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock having two or four distinct clockwise edge differences.at n=1A209912