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A165405
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a(0)=1, a(1)=3,a(n)=6*a(n-2)-a(n-1).
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2
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1, 3, 3, 15, 3, 87, -69, 591, -1005, 4551, -10581, 37887, -101373, 328695, -936933, 2909103, -8530701, 25985319, -77169525, 233081439, -696098589, 2094587223, -6271178757, 18838702095, -56465774637, 169497987207, -508292635029
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OFFSET
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0,2
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COMMENTS
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a(n)/a(n-1) tends to -3.
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LINKS
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FORMULA
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G.f.: (1+4x)/(1+x-6x^2). a(n)= Sum_{k, 0<=k<=n}A112555(n,k)*2^k.
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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