Number of connected circulant graphs on n nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =5a(6) =3a(7) =8a(8) =6a(9) =16a(10) =7a(11) =38a(12) =13a(13) =43a(14) =40a(15) =72a(16) =35a(17) =178a(18) =59a(19) =314a(20) =195a(21) =407a(22) =187a(23) =1256a(24) =420a(25) =1385a(26) =920a(27) =3054a(28) =1181a(29) =8702