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 A123001 #8 Mar 30 2012 16:50:32 %S A123001 10,100,101,1000,1001,1010,1011,10000,10001,10010,10011,10100,10101, %T A123001 10110,10111,100000,100001,100010,100011,100100,100101,100110,100111, %U A123001 101000,101001,101010,101011,101100,101101,101110,101111 %N A123001 Binary numbers that start 10... %H A123001 T. D. Noe, <a href="/A123001/b123001.txt">Table of n, a(n) for n=1..1023</a> %Y A123001 See A004754 for their decimal equivalents. %K A123001 nonn,base %O A123001 1,1 %A A123001 _N. J. A. Sloane_, Oct 11 2010