Number of connected simple graphs with n vertices, n+2 edges, and vertex degrees no more than 4.

A112619

Number of connected simple graphs with n vertices, n+2 edges, and vertex degrees no more than 4.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =18a(6) =79a(7) =326a(8) =1278a(9) =4875a(10) =17978a(11) =64720a(12) =227842a(13) =787546a(14) =2678207a(15) =8982754a(16) =29761361a(17) =97558039a(18) =316778169a(19) =1019996738a(20) =3259673935a(21) =10347077497a(22) =32644696187a(23) =102425388286a(24) =319754805262

External references