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A198851 3*8^n-1. 1
2, 23, 191, 1535, 12287, 98303, 786431, 6291455, 50331647, 402653183, 3221225471, 25769803775, 206158430207, 1649267441663, 13194139533311, 105553116266495, 844424930131967, 6755399441055743, 54043195528445951 (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 (9,-8).

FORMULA

a(n) = 8*a(n-1)+7. a(n) = 9*a(n-1)-8*a(n-2), n>1.

G.f.: (5*x+2)/(8*x^2-9*x+1) [From Harvey P. Dale, Dec 07 2011]

MATHEMATICA

3*8^Range[0, 30]-1 (* or *) LinearRecurrence[{9, -8}, {2, 23}, 30] (* Harvey P. Dale, Dec 07 2011 *)

PROG

(MAGMA) [3*8^n-1: n in [0..30]]

CROSSREFS

Sequence in context: A189977 A130547 A200846 * A173341 A118756 A133955

Adjacent sequences:  A198848 A198849 A198850 * A198852 A198853 A198854

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Oct 31 2011

STATUS

approved

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Last modified February 19 04:09 EST 2020. Contains 332037 sequences. (Running on oeis4.)