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 A084456 #4 Jul 29 2017 12:42:31 %S A084456 111,1011,1101,100110,10011,11001,10001100,1000110,100011,10101, %T A084456 1001010,100101,1010010,101001,100010100,10001010,1000101,1100010, %U A084456 110001,1000011000,100001100,10000110,1000011,1100001,100000110000,10000011000 %N A084456 Sequence A084457 in binary. %K A084456 nonn %O A084456 0,1 %A A084456 _Antti Karttunen_, Jun 02 2003