Sum{d(i)*5^i: i=0,1,...,m}, where Sum{d(i)*4^i: i=0,1,...,m} is the base 4 representation of n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =7a(6) =8a(7) =10a(8) =11a(9) =12a(10) =13a(11) =15a(12) =16a(13) =17a(14) =18a(15) =25a(16) =26a(17) =27a(18) =28a(19) =30a(20) =31a(21) =32a(22) =33a(23) =35a(24) =36a(25) =37a(26) =38a(27) =40a(28) =41a(29) =42