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 A084472 #7 Aug 27 2019 09:38:39
%S A084472 1,100,11,10000,1001,1100,111,1000000,100001,100100,10011,110000,
%T A084472 11001,11100,1111,100000000,10000001,10000100,1000011,10010000,
%U A084472 1001001,1001100,100111,11000000,1100001,1100100,110011,1110000
%N A084472 Write n in binary and replace 0 with 00.
%C A084472 a(n)=A007088(A084471(n)).
%t A084472 Table[FromDigits[Flatten[IntegerDigits[n,2]/.(0->{0,0})]],{n,30}] (* _Harvey P. Dale_, Aug 27 2019 *)
%Y A084472 Cf. A084474, A038585.
%K A084472 nonn
%O A084472 1,2
%A A084472 _Reinhard Zumkeller_, May 27 2003