Number of unlabeled trivalent 3-connected bipartite planar graphs with 2n nodes without subgraphs R2 and R4.

A007084

Number of unlabeled trivalent 3-connected bipartite planar graphs with 2n nodes without subgraphs R2 and R4.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =1a(7) =4a(8) =5a(9) =14a(10) =28a(11) =86a(12) =211a(13) =648a(14) =1878a(15) =5931a(16) =18326a(17) =58746a(18) =187620a(19) =608065a(20) =1975191a(21) =6461809a(22) =21212414

External references