"CGK" (necklace, element, unlabeled) transform of 1,3,5,7,...

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =15a(5) =37a(6) =83a(7) =184a(8) =443a(9) =1007a(10) =2369a(11) =5536a(12) =12941a(13) =30203a(14) =70383a(15) =164822a(16) =380489a(17) =887367a(18) =2051543a(19) =4727014a(20) =10906833a(21) =25042049a(22) =57393717a(23) =130934806a(24) =298811135a(25) =679012501a(26) =1538770499a(27) =3479066516a(28) =7844360471