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%I #7 Mar 11 2014 01:32:18
%S 1,0,1,0,0,-1,0,-1,1,0,1,0,0,-1,0,-1,1,0,1,0,0,-1,0,-1,1,0,1,0,0,-1,0,
%T -1,2,1,2,1,1,0,1,0,2,1,2,1,1,0,1,0,2,1,2,1,1,0,1,0,2,1,2,1,1,0,1,0,1,
%U 0,1,0,0,-1,0,-1,1,0,1,0,0,-1,0,-1,1,0,1,0,0,-1,0,-1,1,0,1,0,0,-1,0,-1,2,1,2,1,1,0,1,0,2,1,2,1,1,0,1,0,2,1,2,1,1,0,1,0,2
%N a(0)=1. a(m +2^n) = a(m) - a(n), 0 <= m <= 2^n -1.
%K easy,sign
%O 0,33
%A _Leroy Quet_, Mar 22 2006
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