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A013726
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a(n) = 21^(2*n + 1).
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3
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21, 9261, 4084101, 1801088541, 794280046581, 350277500542221, 154472377739119461, 68122318582951682301, 30041942495081691894741, 13248496640331026125580781, 5842587018385982521381124421
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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) = 441*a(n-1); a(0)=21.
G.f.: 21/(1-441*x). (End)
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MAPLE
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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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