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 A115771 #2 Mar 31 2012 13:21:10 %S A115771 0,111,1110,1111,11100,11110,11111,111000,111100,111110,111111, %T A115771 1110000,1111000,1111100,1111110,1111111,11100000,11110000,11111000, %U A115771 11111100,11111110,11111111,111000000,111000111,111100000,111110000 %N A115771 Sequence A115770 in binary. %Y A115771 Cf. a(n) = A007088(A115770(n)). %K A115771 nonn,base %O A115771 0,2 %A A115771 _Antti Karttunen_, Jan 30 2006