OFFSET
1,2
FORMULA
a(n)=sum{k=0..n, abs(mu(n-k+1))*10^k}
EXAMPLE
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.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jul 20 2005
STATUS
approved