%I
%S 0,0,0,1,0,0,0,1,0,1,0,1,0,1,0,1,0,0,0,1,0,1,1,0,1,0,1,0,1,0,1,0,0,0,
%T 1,0,1,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,0,0,1,
%U 0,1,0,1,0,1,0,1,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,0,0,1,0,1
%N Characteristic function of A057166.
%H <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a>
%F a(n) = (1A160357(n))/2 = 1A076213(n1).
%K nonn
%O 1,1
%A _M. F. Hasler_, Jun 03 2009
