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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #2 Mar 30 2012 18:59:26
%S 0,1,0,2,-1,1,0,0,0,1,0,-1,0,0,0,2,-1,0,0,-1,0,0,0,0,0,1,0,0,0,1,0,0,
%T 0,0,0,2,-1,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,-1,0,0,0,0,0,0,0,2,-1,
%U 0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,2,-1
%N a(n)=A167683(n)-A167686(n).
%K sign
%O 0,4
%A _Paul Barry_, Nov 09 2009