Duplicate of A030709.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =8a(7) =9a(8) =12a(9) =15a(10) =17a(11) =18a(12) =22a(13) =24a(14) =27a(15) =30a(16) =34a(17) =36a(18) =39a(19) =42a(20) =46a(21) =48a(22) =52a(23) =57a(24) =61a(25) =65a(26) =68a(27) =71