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A052920
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a(n) = a(n-3) + a(n-5).
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0
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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, 58, 57, 80, 92, 101, 138, 149, 181, 230, 250, 319, 379, 431, 549, 629, 750, 928, 1060, 1299, 1557, 1810, 2227, 2617, 3109, 3784, 4427, 5336, 6401, 7536, 9120, 10828
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,9
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 903
E. Wilson, The Scales of Mt. Meru
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FORMULA
| G.f.: 1/(1-x^3-x^5)
Recurrence: {a(1)=0, a(0)=1, a(2)=0, a(3)=1, a(4)=0, a(n)+a(n+2)-a(n+5)}
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))
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MAPLE
| spec := [S, {S=Sequence(Prod(Union(Z, Prod(Z, Z, Z)), Z, Z))}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A102426 A092865 A098925 * A089141 A170820 A003687
Adjacent sequences: A052917 A052918 A052919 * A052921 A052922 A052923
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jun 05 2000
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