'Eban' numbers (the letter 'e' is banned!).

Terms

a(0) =2a(1) =4a(2) =6a(3) =30a(4) =32a(5) =34a(6) =36a(7) =40a(8) =42a(9) =44a(10) =46a(11) =50a(12) =52a(13) =54a(14) =56a(15) =60a(16) =62a(17) =64a(18) =66a(19) =2000a(20) =2002a(21) =2004a(22) =2006a(23) =2030a(24) =2032a(25) =2034a(26) =2036a(27) =2040a(28) =2042a(29) =2044