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1, 18, 188, 1888, 18888, 188888, 1888888, 18888888, 188888888, 1888888888, 18888888888, 188888888888, 1888888888888, 18888888888888, 188888888888888, 1888888888888888, 18888888888888888, 188888888888888888, 1888888888888888888, 18888888888888888888
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: (1 + 7*x)/((1 - x)*(1 - 10*x)).
a(n) = 11*a(n-1) - 10*a(n-2).
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MATHEMATICA
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Table[(17 10^n - 8)/9, {n, 0, 20}]
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PROG
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(Magma) [(17*10^n-8)/9: n in [0..20]];
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CROSSREFS
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Cf. similar sequences listed in A246057.
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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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