%I #5 Feb 15 2014 12:32:58
%S 1,2,-1,3,3,-4,3,4,4,-9,3,5,5,5,-14,3,4,6,6,6,-23,9,-1,7,7,7,7,-32,9,
%T 1,5,8,8,8,8,-45,15,-1,11,1,9,9,9,9,-58,15,1,13,-2,10,10,10,10,10,-71,
%U 17,5,17,-13,11,11,11,11,11,11,-90,27,-1,19,-11
%N First differences of A163280.
%Y Cf. A161344, A163280, A163983, A164000.
%K sign
%O 1,2
%A _Omar E. Pol_, Aug 08 2009
%E More terms from _Michel Marcus_, Feb 15 2014