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A091095
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Expansion of (1+4x-24x^2)/((1-4x)(1+4x)).
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0
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1, 4, -8, 64, -128, 1024, -2048, 16384, -32768, 262144, -524288, 4194304, -8388608, 67108864, -134217728, 1073741824, -2147483648, 17179869184, -34359738368, 274877906944, -549755813888, 4398046511104, -8796093022208, 70368744177664
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OFFSET
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0,2
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COMMENTS
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a(0)=1, a(2n-1)=k^(2n-1), a(2n)=(2-k)k^(2n-1), k=4; G.f.: (1+kx+(2-2k)kx^2)/((1-kx)(1+kx)), k=4.
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LINKS
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FORMULA
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a(n)=4^n/4+(-3)(-4)^n/4+6*0^n/4
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MATHEMATICA
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LinearRecurrence[{0, 16}, {1, 4, -8}, 30] (* Harvey P. Dale, Dec 14 2019 *)
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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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STATUS
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approved
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