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A013725
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a(n) = 20^(2*n + 1).
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3
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20, 8000, 3200000, 1280000000, 512000000000, 204800000000000, 81920000000000000, 32768000000000000000, 13107200000000000000000, 5242880000000000000000000, 2097152000000000000000000000
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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) = 400*a(n-1); a(0)=20.
G.f.: 20/(1-400*x). (End)
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MAPLE
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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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