a(n) = position of n in A026247.

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =2a(5) =10a(6) =13a(7) =14a(8) =5a(9) =6a(10) =18a(11) =21a(12) =8a(13) =9a(14) =25a(15) =26a(16) =11a(17) =12a(18) =30a(19) =33a(20) =34a(21) =15a(22) =37a(23) =38a(24) =41a(25) =16a(26) =17a(27) =45a(28) =46a(29) =19