Position of n in A026257.

Terms

a(0) =1a(1) =2a(2) =5a(3) =3a(4) =4a(5) =6a(6) =9a(7) =10a(8) =11a(9) =14a(10) =7a(11) =8a(12) =17a(13) =19a(14) =20a(15) =21a(16) =12a(17) =13a(18) =15a(19) =26a(20) =28a(21) =29a(22) =30a(23) =16a(24) =18a(25) =34a(26) =37a(27) =39a(28) =40a(29) =22