187620domain: NAppears in sequencesNumber of unlabeled trivalent 3-connected bipartite planar graphs with 2n nodes without subgraphs R2 and R4.at n=18A007084Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.at n=8A316204