%I A021015
%S A021015 0,9,0,9,0,9,0,9,0,9,0,9,0,9,0,9,0,9,0,9,0,9,0,9,0,9,0
%N A021015 Duplicate of A010680.
%Y A021015 Sequence in context: A086199 A167545 A059058 this_sequence A010680 A131566 
               A160576
%Y A021015 Adjacent sequences: A021012 A021013 A021014 this_sequence A021016 A021017 
               A021018
%K A021015 dead
%O A021015 0,2