Complement of A003256.

Terms

a(0) =1a(1) =3a(2) =4a(3) =6a(4) =8a(5) =10a(6) =11a(7) =13a(8) =15a(9) =16a(10) =18a(11) =20a(12) =22a(13) =23a(14) =25a(15) =27a(16) =29a(17) =30a(18) =32a(19) =34a(20) =35a(21) =37a(22) =39a(23) =41a(24) =42a(25) =44a(26) =46a(27) =48a(28) =50a(29) =52