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%I
%S 1,1,2,3,4,4,4,5,5,5,5,6,6,6,7,6,7,8,7,7,8,9,10,11,12,12,13,13,14,15,
%T 15,15,16,16,17,18,18,18,18,17,18,18,17,17,17,18,19,19,20,20,20,20,21,
%U 21,21,21,21,21,22,22,22,22,22,21,22,22,21,21
%N a(n)=(# 1's)-(# 0's) in first n terms of A030401.
%K nonn
%O 1,3
%A _Clark Kimberling_
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