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%I #3 Mar 30 2012 18:50:53
%S 1,2,-1,3,-1,4,-2,5,-4,6,-4,7,-6,8,-6,9,-7,10,-9,11,-9,12,-10,13,-12,
%T 14,-12,15,-14,16,-14,17,-15,18,-17,19,-17,20,-19,21,-19,22,-20,23,
%U -22,24,-22,25,-23,26,-25,27,-25,28,-27,29,-27,30,-28,31,-30,32,-30,33,-31,34
%N First differences of A113321.
%C a(n) = A113321(n+1) - A113321(n);
%C A000027 is a subsequence: a(A004277(n-1)) = n.
%K sign
%O 1,2
%A _Reinhard Zumkeller_, Oct 26 2005
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