a(n) = Sum_{i = 0..m} d(i)*8^i, where Sum_{i = 0..m} d(i)*4^i is the base 4 representation of n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =8a(5) =9a(6) =10a(7) =11a(8) =16a(9) =17a(10) =18a(11) =19a(12) =24a(13) =25a(14) =26a(15) =27a(16) =64a(17) =65a(18) =66a(19) =67a(20) =72a(21) =73a(22) =74a(23) =75a(24) =80a(25) =81a(26) =82a(27) =83a(28) =88a(29) =89