%I A051793
%S A051793 1,1,1,1,0,1,1,1,1,0,1,1,1,1,2,1,3,1,1,2,5,3,7,1,0,5,13,7,15,0,
%T A051793 5,13,33,15,30,5,23,33,81,30,55,23,79,81,192,55,87,79,239,
%U A051793 192,439,87,95,239,670,439,965,95,49,670,1779,965,2025,49,768
%V A051793 1,1,1,1,0,1,1,1,1,0,-1,1,1,1,2,-1,-3,1,1,2,5,-3,-7,1,0,5,13,-7,-15,0,
%W A051793 -5,13,33,-15,-30,-5,-23,33,81,-30,-55,-23,-79,81,192,-55,-87,-79,-239,
%X A051793 192,439,-87,-95,-239,-670,439,965,-95,49,-670,-1779,965,2025,49,768
%N A051793 a(n)=sum((-1)^i*a(i),i=n-4..n-1), a(1)=1,a(2)=1,a(3)=1,a(4)=1.
%Y A051793 Sequence in context: A126760 A007740 A117811 this_sequence A065371 A006346 
               A088742
%Y A051793 Adjacent sequences: A051790 A051791 A051792 this_sequence A051794 A051795 
               A051796
%K A051793 easy,nice,sign
%O A051793 1,15
%A A051793 Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 10 1999