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A198767 8*5^n-1. 1
7, 39, 199, 999, 4999, 24999, 124999, 624999, 3124999, 15624999, 78124999, 390624999, 1953124999, 9765624999, 48828124999, 244140624999, 1220703124999, 6103515624999, 30517578124999, 152587890624999, 762939453124999 (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 (6,-5).

FORMULA

a(n) = 5*a(n-1)+4.

a(n) = 6*a(n-1)-5*a(n-2), n>1.

G.f.: (7 - 3*x)/(1 - 6*x + 5*x^2). - Vincenzo Librandi, Jan 04 2013

MATHEMATICA

CoefficientList[Series[(7 - 3*x)/(1 - 6*x + 5*x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 04 2013 *)

PROG

(MAGMA) [8*5^n-1: n in [0..30]];

CROSSREFS

Cf. A024049, A057651, A081655.

Sequence in context: A004057 A081898 A034267 * A026752 A026379 A026708

Adjacent sequences:  A198764 A198765 A198766 * A198768 A198769 A198770

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Oct 30 2011

STATUS

approved

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Last modified April 17 16:54 EDT 2021. Contains 343063 sequences. (Running on oeis4.)