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A013780
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a(n) = 4^(4*n + 1).
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2
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4, 1024, 262144, 67108864, 17179869184, 4398046511104, 1125899906842624, 288230376151711744, 73786976294838206464, 18889465931478580854784, 4835703278458516698824704, 1237940039285380274899124224
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 256*a(n-1); a(0)=4.
G.f.: 4/(1-256*x). (End)
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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