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