Duplicate of A026137.

Terms

a(0) =1a(1) =3a(2) =2a(3) =6a(4) =7a(5) =9a(6) =4a(7) =12a(8) =5a(9) =15a(10) =16a(11) =18a(12) =19a(13) =21a(14) =8a(15) =24a(16) =25a(17) =27a(18) =10a(19) =30a(20) =11a(21) =33a(22) =34a(23) =36a(24) =13a(25) =39a(26) =14a(27) =42a(28) =43a(29) =45