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18, 558, 5958, 59958, 599958, 5999958, 59999958, 599999958, 5999999958, 59999999958, 599999999958, 5999999999958, 59999999999958, 599999999999958, 5999999999999958, 59999999999999958, 599999999999999958
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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FORMULA
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G.f. 18*x*(1+20*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011
a(n) = 18*A033175(n-1). - R. J. Mathar, Aug 24 2011
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MATHEMATICA
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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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