Search: id:A052920
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%I A052920
%S A052920 1,0,0,1,0,1,1,0,2,1,1,3,1,3,4,2,6,5,5,10,7,11,15,12,21,22,23,36,34,44,
%T A052920 58,57,80,92,101,138,149,181,230,250,319,379,431,549,629,750,928,1060,
%U A052920 1299,1557,1810,2227,2617,3109,3784,4427,5336,6401,7536,9120,10828
%N A052920 a(n) = a(n-3) + a(n-5).
%H A052920 INRIA Algorithms Project, <a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=903">
               Encyclopedia of Combinatorial Structures 903</a>
%H A052920 E. Wilson, <a href="http://www.anaphoria.com/meruone.PDF">The Scales 
               of Mt. Meru</a>
%F A052920 G.f.: 1/(1-x^3-x^5)
%F A052920 Recurrence: {a(1)=0, a(0)=1, a(2)=0, a(3)=1, a(4)=0, a(n)+a(n+2)-a(n+5)}
%F A052920 Sum(1/3233*(-60+100*_alpha^2+250*_alpha^4+661*_alpha+36*_alpha^3)*_alpha^(-1-n), 
               _alpha=RootOf(-1+_Z^3+_Z^5))
%p A052920 spec := [S,{S=Sequence(Prod(Union(Z,Prod(Z,Z,Z)),Z,Z))},unlabeled]: seq(combstruct[count](spec,
               size=n), n=0..20);
%Y A052920 Sequence in context: A102426 A092865 A098925 this_sequence A089141 A003687 
               A104575
%Y A052920 Adjacent sequences: A052917 A052918 A052919 this_sequence A052921 A052922 
               A052923
%K A052920 easy,nonn
%O A052920 0,9
%A A052920 encyclopedia(AT)pommard.inria.fr, Jan 25 2000
%E A052920 More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jun 05 2000

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