Positions of odd numbers in A000408.

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =9a(5) =10a(6) =14a(7) =15a(8) =17a(9) =19a(10) =22a(11) =24a(12) =26a(13) =29a(14) =31a(15) =32a(16) =35a(17) =36a(18) =37a(19) =39a(20) =41a(21) =43a(22) =46a(23) =48a(24) =50a(25) =52a(26) =54a(27) =58a(28) =60a(29) =61