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A199691 11*10^n+1. 1
12, 111, 1101, 11001, 110001, 1100001, 11000001, 110000001, 1100000001, 11000000001, 110000000001, 1100000000001, 11000000000001, 110000000000001, 1100000000000001, 11000000000000001, 110000000000000001, 1100000000000000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

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

FORMULA

a(n) = 10*a(n-1)-9.

a(n) = 11*a(n-1)-10*a(n-2).

G.f.: 3*(4-7*x)/((1-x)*(1-10*x)).

PROG

(MAGMA) [11*10^n+1: n in [0..30]];

CROSSREFS

Sequence in context: A036733 A253091 A123933 * A348150 A077754 A199357

Adjacent sequences:  A199688 A199689 A199690 * A199692 A199693 A199694

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 09 2011

STATUS

approved

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Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)