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 A103175 #8 Sep 08 2013 13:30:37 %S A103175 0,1,100,1100,100000,1010000,11000000,111000000,10000000000, %T A103175 100100000000,1010000000000,10110000000000,110000000000000, %U A103175 1101000000000000,11100000000000000,111100000000000000 %N A103175 A001787 written in base 2. %Y A103175 Cf. A089398. %K A103175 nonn,easy %O A103175 0,3 %A A103175 _Philippe Deléham_, Mar 30 2005 %E A103175 More terms from _Erich Friedman_, Aug 08 2005