"CIK" (necklace, indistinct, unlabeled) transform of 3,5,7...

Terms

a(0) =3a(1) =11a(2) =33a(3) =114a(4) =397a(5) =1524a(6) =5873a(7) =23492a(8) =95033a(9) =390262a(10) =1617513a(11) =6764338a(12) =28478813a(13) =120631428a(14) =513569941a(15) =2196269672a(16) =9429031893a(17) =40621573968a(18) =175544747673a(19) =760719000950