Numbers with no consecutive equal base 4 digits.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =7a(6) =8a(7) =9a(8) =11a(9) =12a(10) =13a(11) =14a(12) =17a(13) =18a(14) =19a(15) =24a(16) =25a(17) =27a(18) =28a(19) =29a(20) =30a(21) =33a(22) =34a(23) =35a(24) =36a(25) =38a(26) =39a(27) =44a(28) =45a(29) =46