A self-generating sequence.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =8a(5) =10a(6) =12a(7) =14a(8) =15a(9) =16a(10) =19a(11) =20a(12) =21a(13) =24a(14) =25a(15) =27a(16) =28a(17) =32a(18) =33a(19) =34a(20) =37a(21) =38a(22) =40a(23) =42a(24) =43a(25) =44a(26) =46a(27) =47a(28) =48a(29) =51