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A199564 6*9^n+1. 2
7, 55, 487, 4375, 39367, 354295, 3188647, 28697815, 258280327, 2324522935, 20920706407, 188286357655, 1694577218887, 15251194969975, 137260754729767, 1235346792567895, 11118121133111047, 100063090197999415, 900567811781994727 (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 (10,-9).

FORMULA

a(n) = 9*a(n-1)-8.

a(n) = 10*a(n-1)-9*a(n-2).

G.f.: (7-15*x)/((1-x)*(1-9*x)).

MATHEMATICA

6*9^Range[0, 20]+1 (* or *) LinearRecurrence[{10, -9}, {7, 55}, 20] (* Harvey P. Dale, Apr 16 2014 *)

PROG

(MAGMA) [6*9^n+1: n in [0..30]];

CROSSREFS

Sequence in context: A108628 A116862 A096307 * A225032 A124403 A005012

Adjacent sequences:  A199561 A199562 A199563 * A199565 A199566 A199567

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 08 2011

STATUS

approved

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Last modified August 10 19:52 EDT 2020. Contains 336381 sequences. (Running on oeis4.)