a(n) = position of n in A026266.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =8a(7) =11a(8) =13a(9) =7a(10) =9a(11) =10a(12) =12a(13) =17a(14) =20a(15) =21a(16) =22a(17) =23a(18) =14a(19) =15a(20) =16a(21) =18a(22) =19a(23) =28a(24) =30a(25) =32a(26) =35a(27) =37a(28) =24a(29) =25