78105333988domain: NAppears in sequencesHalf the number of n X 6 binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies.at n=6A183252Half the number of nX(n+1) binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies.at n=5A183254