28641domain: NAppears in sequencesNumber of independent sets in rooted plane trees on n nodes.at n=7A007857a(n) = 7*2^(n-1) - 2*n - 5.at n=12A168617Number of (n+1) X 6 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.at n=13A186458