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 A110444 #2 Mar 30 2012 18:59:09
%S A110444 1,11,111,1110,11101,111011,1110111,11101110,111011100,1110111001,
%T A110444 11101110011,111011100110,1110111001101,11101110011011,
%U A110444 111011100110111,1110111001101110,11101110011011101,111011100110111010
%N A110444 Binary expansion of A074988.
%F A110444 a(n)=sum{k=0..n, abs(mu(n-k+1))*10^k}
%e A110444 a(6)=111011 since mu(1)^2,mu(2)^2,mu(3)^2,mu(4)^2,mu(5)^2,mu(6)^2=1,1,1,0,1,1.
%K A110444 easy,nonn
%O A110444 1,2
%A A110444 _Paul Barry_, Jul 20 2005