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A165622
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a(n)=(-4)*a(n-1)+8 with a(0)=1.
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2
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1, 4, -8, 40, -152, 616, -2456, 9832, -39320, 157288, -629144, 2516584, -10066328, 40265320, -161061272, 644245096, -2576980376, 10307921512, -41231686040, 164926744168, -659706976664, 2638827906664, -10555311626648, 42221246506600, -168884986026392
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (1+7x)/(1+3x-4x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)*3^(n-k). a(0)=1, a(1)=4, a(n)=4*a(n-2)-3*a(n-1).
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MATHEMATICA
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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