%I A098574
%S A098574 1,1,1,1,1,1,1,2,4,7,11,16,22,29,38,51,71,102,149,218,316,452,639,897,
%T A098574 1257,1766,2493,3536,5031,7165,10196,14484,20538,29085,41168,58282,
%U A098574 82561,117036,165995,235492,334074,473824,671856,952449,1350078,1913702
%N A098574 Sum C(n-5k,2k), k=0..floor(n/7).
%D A098574 R. Austin and R. K. Guy, Binary sequences without isolated ones, Fib. 
               Quart., 16 (1978), 84-86.
%F A098574 G.f. (1-x)/(1-2x+x^2-x^7)
%p A098574 ZL:=[S, {a = Atom, b = Atom, S = Prod(X,Sequence(Prod(X,X,b))), X = Sequence(b,
               card >= 3)}, unlabelled]: seq(combstruct[count](ZL, size=n), n=3..48); 
               - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 26 2008
%Y A098574 Cf. A005251, A005252, A005253, A005689.
%Y A098574 Sequence in context: A025739 A000124 A152947 this_sequence A005689 A131075 
               A133523
%Y A098574 Adjacent sequences: A098571 A098572 A098573 this_sequence A098575 A098576 
               A098577
%K A098574 easy,nonn
%O A098574 0,8
%A A098574 Paul Barry (pbarry(AT)wit.ie), Sep 16 2004