547050257224domain: NAppears in sequencesHalf the number of (n+1)X4 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.at n=5A209946Half the number of (n+1)X7 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.at n=2A209949