Number of unlabeled trivalent 3-connected bipartite planar graphs with 2n nodes without subgraphs R1 and R4.

A007085

Number of unlabeled trivalent 3-connected bipartite planar graphs with 2n nodes without subgraphs R1 and R4.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =0a(9) =0a(10) =1a(11) =3a(12) =1a(13) =5a(14) =4a(15) =11a(16) =20a(17) =46a(18) =89a(19) =243a(20) =525a(21) =1359a(22) =3316

External references