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A022029
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a(n) = 3*a(n-1) + a(n-2) - a(n-3) - a(n-5).
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1
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4, 13, 42, 135, 433, 1388, 4449, 14260, 45706, 146496, 469546, 1504979, 4823727, 15460908, 49554976, 158832563, 509086778, 1631714194, 5229935889, 16762880107, 53728029453, 172207945799, 551957272549
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OFFSET
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0,1
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COMMENTS
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Sequence agrees with A010919 for n <= 35 only.
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LINKS
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FORMULA
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G.f.: (4+x-x^2-x^4)/(1-3x-x^2+x^3+x^5). - R. J. Mathar, Oct 25 2008
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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