Erroneous version of A026461.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =9a(6) =11a(7) =12a(8) =14a(9) =15a(10) =17a(11) =18a(12) =19a(13) =21a(14) =24a(15) =27a(16) =29a(17) =30a(18) =33a(19) =35a(20) =37a(21) =38