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A013714
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a(n) = 9^(2*n + 1).
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3
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9, 729, 59049, 4782969, 387420489, 31381059609, 2541865828329, 205891132094649, 16677181699666569, 1350851717672992089, 109418989131512359209, 8862938119652501095929, 717897987691852588770249, 58149737003040059690390169
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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) = 81*a(n-1); a(0)=9.
G.f.: 9/(1-81*x). (End)
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MATHEMATICA
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9^(2*Range[0, 20]+1) (* or *) NestList[81#&, 9, 20] (* Harvey P. Dale, May 25 2020 *)
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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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