%I A098577
%S A098577 1,1,1,1,1,3,7,13,21,31,47,77,133,231,391,645,1053,1727,2863,4781,7989,
%T A098577 13303,22071,36565,60621,100655,167295,278077,461989,767143,1273607,
%U A098577 2114661,3511869,5833055,9688527,16091213,26723221,44378967,73700823
%N A098577 Sum C(n-3k,2k)2^k, k=0..floor(n/5).
%F A098577 G.f.: (1-x)/((1-x)^2-2x^5); a(n)=a(n-1)-a(n-2)+2a(n-5).
%Y A098577 Cf. A098575, A005253.
%Y A098577 Sequence in context: A002061 A063541 A011898 this_sequence A004136 A147409 
               A147342
%Y A098577 Adjacent sequences: A098574 A098575 A098576 this_sequence A098578 A098579 
               A098580
%K A098577 easy,nonn
%O A098577 0,6
%A A098577 Paul Barry (pbarry(AT)wit.ie), Sep 16 2004