This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A140316 #6 Nov 21 2013 12:49:21
%S A140316 1,2,1,11,12,2,21,22,1,11,12,11,111,112,12,121,122,2,21,22,21,211,212,
%T A140316 22,221,222,1,11,12,11,111,112,12,121,122,11,111,112,111,1111,1112,
%U A140316 112,1121,1122,12,121,122,121,1211,1212,122,1221,1222,2,21,22,21,211,212,22
%N A140316 Write n in base 3, delete 0's.
%C A140316 This is to A038585 as A007088 is to A007089.
%e A140316 a(29) = 12 because 29 base 3 = A007089(29) = 1002 and upon deleting 0's, this becomes 12. Note the fixed points (input in decimal, output in zeroless base 3) begin 1, 2, 21, 111, ... with for example, 21 base 10 becoming 21 base 3 = A007089(21) = 210 and upon deleting 0's, this becomes 21 again; and 111 base 10 becoming A007089(111) = 11010 and upon deleting 0's, this becomes 111 again.
%t A140316 Table[FromDigits[DeleteCases[IntegerDigits[n,3],0]],{n,60}] (* _Harvey P. Dale_, Oct 23 2011 *)
%Y A140316 Cf. A007088, A007089, A038585.
%K A140316 base,easy,nonn
%O A140316 1,2
%A A140316 _Jonathan Vos Post_, May 26 2008