Inverse of the Doudna sequence A005940.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =9a(7) =8a(8) =7a(9) =10a(10) =17a(11) =12a(12) =33a(13) =18a(14) =11a(15) =16a(16) =65a(17) =14a(18) =129a(19) =20a(20) =19a(21) =34a(22) =257a(23) =24a(24) =13a(25) =66a(26) =15a(27) =36a(28) =513a(29) =22