Number of cyclic graphs with oriented edges on n nodes (up to symmetry of dihedral group).

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =9a(6) =10a(7) =22a(8) =30a(9) =62a(10) =94a(11) =192a(12) =316a(13) =623a(14) =1096a(15) =2122a(16) =3856a(17) =7429a(18) =13798a(19) =26500a(20) =49940a(21) =95885a(22) =182362a(23) =350650a(24) =671092a(25) =1292762a(26) =2485534a(27) =4797886a(28) =9256396a(29) =17904476