Base 4 self or Colombian numbers (not of form k + sum of base 4 digits of k).

Terms

a(0) =1a(1) =3a(2) =8a(3) =13a(4) =18a(5) =20a(6) =25a(7) =30a(8) =35a(9) =37a(10) =42a(11) =47a(12) =52a(13) =54a(14) =59a(15) =64a(16) =73a(17) =78a(18) =83a(19) =85a(20) =90a(21) =95a(22) =100a(23) =102a(24) =107a(25) =112a(26) =117a(27) =119a(28) =124a(29) =129