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Search: id:A132868
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| A132868 |
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a(n)=3a(n-1)-a(n-3)+3a(n-4),n > 3. |
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+0
3
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OFFSET
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0,2
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FORMULA
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4a(n)=3^(n+1) + hexaperiodic (1, 3, 1, -1, -3, -1).
O.g.f.: (-1+2*x^2)/((3*x-1)*(x+1)*(x^2-x+1)) = -(3/4)/(3*x-1)-(1/12)/(x+1)+(1/3)*(x+1)/(x^2-x+1) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 28 2007
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CROSSREFS
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Cf. A129339.
Sequence in context: A132364 A030238 A110490 this_sequence A056783 A071688 A110149
Adjacent sequences: A132865 A132866 A132867 this_sequence A132869 A132870 A132871
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Nov 22 2007
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