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 A169631 #5 Apr 09 2014 23:46:14 %S A169631 0,1,11,110,10,111,1101,10100,1100,10101,1011,10110,1010,10111,1001, %T A169631 11000,1000,11001,101011,111110,101010,111111,101001,10010,101010, %U A169631 10001,101011,10000,101100,1111,101101,1110,101110,1001111,1110001 %N A169631 Recamán's sequence (A005132) written in binary. %K A169631 nonn %O A169631 0,3 %A A169631 _Eric Desbiaux_, Mar 15 2010