Number of connected transitive trivalent (or cubic) graphs with 2n nodes.

Terms

a(0) =1a(1) =2a(2) =2a(3) =3a(4) =4a(5) =3a(6) =4a(7) =5a(8) =7a(9) =3a(10) =11a(11) =5a(12) =6a(13) =10a(14) =10a(15) =5a(16) =12a(17) =5a(18) =12a(19) =10a(20) =7a(21) =5a(22) =32a(23) =9a(24) =10a(25) =13a(26) =16a(27) =7a(28) =38a(29) =7