a(n) = position of n in A026264.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =5a(6) =6a(7) =8a(8) =9a(9) =11a(10) =13a(11) =16a(12) =17a(13) =18a(14) =10a(15) =12a(16) =14a(17) =15a(18) =23a(19) =24a(20) =25a(21) =26a(22) =28a(23) =31a(24) =19a(25) =20a(26) =21a(27) =22a(28) =34a(29) =36