13183187396domain: NAppears in sequencesHalf the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having at most one duplicate clockwise edge difference.at n=6A209945Half the number of (n+1)X8 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.at n=1A209950