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A246059
(17*10^n-8)/9.
2
1, 18, 188, 1888, 18888, 188888, 1888888, 18888888, 188888888, 1888888888, 18888888888, 188888888888, 1888888888888, 18888888888888, 188888888888888, 1888888888888888, 18888888888888888, 188888888888888888, 1888888888888888888, 18888888888888888888
OFFSET
0,2
FORMULA
G.f.: (1 + 7*x)/((1 - x)*(1 - 10*x)).
a(n) = 11*a(n-1) - 10*a(n-2).
MATHEMATICA
Table[(17 10^n - 8)/9, {n, 0, 20}]
PROG
(Magma) [(17*10^n-8)/9: n in [0..20]];
CROSSREFS
Cf. similar sequences listed in A246057.
Sequence in context: A155665 A036396 A036394 * A288836 A341393 A023016
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Aug 13 2014
STATUS
approved