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A199215 4*5^n+1. 1
5, 21, 101, 501, 2501, 12501, 62501, 312501, 1562501, 7812501, 39062501, 195312501, 976562501, 4882812501, 24414062501, 122070312501, 610351562501, 3051757812501, 15258789062501, 76293945312501, 381469726562501, 1907348632812501 (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).

G.f.: (5-9*x)/((1-x)*(1-5*x)).  - Bruno Berselli, Nov 04 2011

MATHEMATICA

4*5^Range[0, 30]+1 (* or *) LinearRecurrence[{6, -5}, {5, 21}, 30] (* Harvey P. Dale, Mar 30 2018 *)

PROG

(MAGMA) [4*5^n+1: n in [0..30]];

CROSSREFS

Sequence in context: A017969 A050897 A338673 * A204061 A046633 A280623

Adjacent sequences:  A199212 A199213 A199214 * A199216 A199217 A199218

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 04 2011

STATUS

approved

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Last modified September 17 05:32 EDT 2021. Contains 347478 sequences. (Running on oeis4.)