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A199309 (7*5^n+1)/2. 1
4, 18, 88, 438, 2188, 10938, 54688, 273438, 1367188, 6835938, 34179688, 170898438, 854492188, 4272460938, 21362304688, 106811523438, 534057617188, 2670288085938, 13351440429688, 66757202148438, 333786010742188, 1668930053710938 (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)-2.

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

G.f.: (4-6*x)/((1-x)*(1-5*x)).

MATHEMATICA

(7*5^Range[0, 30]+1)/2 (* or *) LinearRecurrence[{6, -5}, {4, 18}, 30] (* Harvey P. Dale, Apr 03 2016 *)

PROG

(MAGMA) [(7*5^n+1)/2: n in [0..30]];

CROSSREFS

Sequence in context: A178577 A130524 A298646 * A083325 A050146 A083879

Adjacent sequences:  A199306 A199307 A199308 * A199310 A199311 A199312

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 05 2011

STATUS

approved

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Last modified February 24 20:12 EST 2020. Contains 332209 sequences. (Running on oeis4.)