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 A115877 #2 Mar 31 2012 13:21:10 %S A115877 0,111,1110,11100,111000,1110000,11100000,111000000,1110000000, %T A115877 11100000000,111000000000,111000000111,1110000000000,1110000000111, %U A115877 1110000001110,11100000000000,11100000000111,11100000001110 %N A115877 Sequence A115876 in binary. %Y A115877 a(n) = A007088(A115876(n)). %K A115877 nonn,base %O A115877 0,2 %A A115877 _Antti Karttunen_, Feb 07 2006