Map n = Sum c_i 10^i to a(n) = Sum c_i 4^i.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =4a(11) =5a(12) =6a(13) =7a(14) =8a(15) =9a(16) =10a(17) =11a(18) =12a(19) =13a(20) =8a(21) =9a(22) =10a(23) =11a(24) =12a(25) =13a(26) =14a(27) =15a(28) =16a(29) =17