%I A124746
%S A124746 1,0,1,0,1,1,1,1,1,2,2,2,2,3,4,4,4,5,7,8,8,9,12,15,16,17,21,27,31,33,38,
%T A124746 48,58,64,71,86,106,122,135,157,192,228,257,292,349,420,485,549,641,769,
%U A124746 905,1034,1190,1410,1674
%V A124746 1,0,1,0,1,-1,1,-1,1,-2,2,-2,2,-3,4,-4,4,-5,7,-8,8,-9,12,-15,16,-17,21,
               -27,31,-33,38,
%W A124746 -48,58,-64,71,-86,106,-122,135,-157,192,-228,257,-292,349,-420,485,-549,
               641,-769,905,
%X A124746 -1034,1190,-1410,1674
%N A124746 Expansion of (1+x^2)/(1-x^4+x^5).
%C A124746 Diagonal sums of A124744.
%F A124746 a(n)=sum{k=0..floor(n/2), C(floor(k/2),n-2k)*(-1)^n}
%Y A124746 Sequence in context: A025774 A001156 A035451 this_sequence A124789 A103372 
               A029082
%Y A124746 Adjacent sequences: A124743 A124744 A124745 this_sequence A124747 A124748 
               A124749
%K A124746 easy,sign
%O A124746 0,10
%A A124746 Paul Barry (pbarry(AT)wit.ie), Nov 06 2006