%I #5 Jan 04 2013 16:19:37
%S 0,1,0,1,1,1,1,2,1,2,2,1,3,2,2,2,3,1,3,2,2,2,1,2,1,2,0,2,0,1,0,2,0,0,
%T 2,-1,2,0,2,0,3,0,3,2,0,4,1,3,1,4,0,4,1,4,2,0,4,0,4,0,4,0,4,0,5,2,0,6,
%U 0,5,1,6,0,7,1,7,4,0,8,1,7,1,8,0,8,1,8,4,0,9,0,8,0,9,-1,9,0,10,4,-1,11,-1
%N First differences of A088670.
%C a(n) = A088670(n+1) - A088670(n).
%Y Cf. A109969.
%K sign,base
%O 1,8
%A _Reinhard Zumkeller_, Jul 06 2005
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