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1, 10, 99, 990, 9900, 99000, 990000, 9900000, 99000000, 990000000, 9900000000, 99000000000, 990000000000, 9900000000000, 99000000000000, 990000000000000, 9900000000000000, 99000000000000000, 990000000000000000
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OFFSET
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0,2
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COMMENTS
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Apply the Riordan array (1-x,x/(1+x)) to 11^n.
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LINKS
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FORMULA
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G.f.: (1-x^2)/(1-10x); a(0)=1, a(1)=10, a(n)=10^n-10^(n-2), n>1.
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MATHEMATICA
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Join[{1, 10}, NestList[10#&, 99, 20]] (* Harvey P. Dale, Sep 18 2022 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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