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 A084504 #4 Jul 29 2017 12:40:28 %S A084504 111,111,111,111,1011,111,111,111,111,111,1011,111,1011,111,111,1011, %T A084504 1101,111,10011,1011,111,10011,1101,111,111,111,111,111,111,111,1011, %U A084504 111,111,1011,111,111,111,1011,1101,111,111,10011,1011,111,111,10011 %N A084504 Sequence A084503 in binary. %F A084504 a(n) = A007088(A084503(n)). %K A084504 nonn %O A084504 0,1 %A A084504 _Antti Karttunen_, Jun 02 2003