a(n+1) = smallest number not containing any digits of a(n), working in base 3.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =8a(5) =9a(6) =26a(7) =27a(8) =80a(9) =81a(10) =242a(11) =243a(12) =728a(13) =729a(14) =2186a(15) =2187a(16) =6560a(17) =6561a(18) =19682a(19) =19683a(20) =59048a(21) =59049a(22) =177146a(23) =177147a(24) =531440a(25) =531441a(26) =1594322a(27) =1594323a(28) =4782968a(29) =4782969