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A199491 (11*7^n+1)/2. 1
6, 39, 270, 1887, 13206, 92439, 647070, 4529487, 31706406, 221944839, 1553613870, 10875297087, 76127079606, 532889557239, 3730226900670, 26111588304687, 182781118132806, 1279467826929639, 8956274788507470, 62693923519552287 (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 (8,-7).

FORMULA

a(n) = 7*a(n-1)-3.

a(n) = 8*a(n-1)-7*a(n-2).

G.f.: 3*(2-3*x)/((1-x)*(1-7*x)).

MATHEMATICA

(11*7^Range[0, 30]+1)/2 (* or *) LinearRecurrence[{8, -7}, {6, 39}, 30] (* Harvey P. Dale, Jan 23 2013 *)

PROG

(MAGMA) [(11*7^n+1)/2: n in [0..30]];

CROSSREFS

Sequence in context: A238809 A006256 A052392 * A147961 A264232 A068765

Adjacent sequences:  A199488 A199489 A199490 * A199492 A199493 A199494

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 07 2011

STATUS

approved

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Last modified June 30 18:41 EDT 2022. Contains 354945 sequences. (Running on oeis4.)