Number of vertex-transitive graphs of valency 4 with n nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =4a(6) =2a(7) =11a(8) =3a(9) =6a(10) =8a(11) =16a(12) =4a(13) =16a(14) =4a(15) =28a(16) =11a(17) =11a(18) =5a(19) =74a(20) =9a(21) =16a(22) =16a(23) =34a(24) =7a(25) =52a(26) =7