Number of embeddings on the sphere of Halin graphs on n unlabeled nodes up to orientation-preserving homeomorphisms.

A380360

Number of embeddings on the sphere of Halin graphs on n unlabeled nodes up to orientation-preserving homeomorphisms.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =2a(7) =4a(8) =7a(9) =16a(10) =32a(11) =76a(12) =181a(13) =443a(14) =1098a(15) =2793a(16) =7127a(17) =18458a(18) =48128a(19) =126580a(20) =334955a(21) =892187a(22) =2388674a(23) =6428489a(24) =17377599a(25) =47174939a(26) =128555088a(27) =351580903a(28) =964696719a(29) =2655197386

External references