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Search: id:A133409
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| 0, 0, 0, 0, 1, 4, 13, 39, 117, 351, 1054, 3163, 9490, 28470, 85410, 256230, 768691, 2306074, 6918223, 20754669, 62264007, 186792021, 560376064, 1681128193, 5043384580, 15130153740, 45390461220, 136171383660
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OFFSET
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0,6
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FORMULA
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a(n+1)-3a(n)=A088911(n+3).
a(n)=4a(n-1)-3a(n-2)-a(n-3)+4a(n-4)-3a(n-5).
O.g.f.: x^4/((3x-1)(1+x)(x^2-x+1)(x-1)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008
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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 25 2007
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008
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