%I A097118
%S A097118 1,1,1,6,16,31,76,201,481,1141,2806,6876,16651,40456,98641,240081,
%T A097118 583801,1420726,3458056,8414391,20474356,49824601,121246801,295040781,
%U A097118 717957766,1747108756,4251463651,10345607376,25175294881,61262300641
%N A097118 Expansion of (1+x)/(1-x)^2-5x^3).
%F A097118 G.f. : (1+x)/(1-2x+x^2-5x^3); a(n)=2a(n-1)-a(n-2)+5a(n-3); a(n)=sum{k=0..floor(n/
               2), binomial(n-k, 2k)5^k }.
%Y A097118 Sequence in context: A005891 A092286 A108182 this_sequence A134465 A036488 
               A131949
%Y A097118 Adjacent sequences: A097115 A097116 A097117 this_sequence A097119 A097120 
               A097121
%K A097118 easy,nonn
%O A097118 0,4
%A A097118 Paul Barry (pbarry(AT)wit.ie), Jul 25 2004