A246059 (17*10^n-8)/9.

1, 18, 188, 1888, 18888, 188888, 1888888, 18888888, 188888888, 1888888888, 18888888888, 188888888888, 1888888888888, 18888888888888, 188888888888888, 1888888888888888, 18888888888888888, 188888888888888888, 1888888888888888888, 18888888888888888888

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..100

Index entries for linear recurrences with constant coefficients, signature (11,-10).

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

Adjacent sequences: A246056 A246057 A246058 * A246060 A246061 A246062

Keyword

nonn,easy

Author

Vincenzo Librandi, Aug 13 2014

Status

approved