%I A138188
%S A138188 1,3,0,3,5,0,5,7,0,7,9,0,9,11,0,11,13,0,13,15,0,15,17,0,17,19,0,19,21,
               0,
%T A138188 21,23,0,23,25,0,25,27,0,27,29,0,29,31,0,31,33,0,33,35,0,35,37,0,37,39,
%U A138188 0,39,41,0,41
%V A138188 1,-3,0,3,-5,0,5,-7,0,7,-9,0,9,-11,0,11,-13,0,13,-15,0,15,-17,0,17,-19,
               0,19,-21,0,21,
%W A138188 -23,0,23,-25,0,25,-27,0,27,-29,0,29,-31,0,31,-33,0,33,-35,0,35,-37,0,
               37,-39,0,39,-41,
%X A138188 0,41
%N A138188 Expansion of (1-2x-2x^2-x^3)/(1+x+x^2-x^3-x^4-x^5).
%C A138188 Partial sums of A138187. Partial sums are A138189.
%Y A138188 Sequence in context: A111862 A060858 A127749 this_sequence A014715 A131656 
               A120987
%Y A138188 Adjacent sequences: A138185 A138186 A138187 this_sequence A138189 A138190 
               A138191
%K A138188 easy,sign
%O A138188 0,2
%A A138188 Paul Barry (pbarry(AT)wit.ie), Mar 04 2008