login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A198647 3*7^n-1 8
2, 20, 146, 1028, 7202, 50420, 352946, 2470628, 17294402, 121060820, 847425746, 5931980228, 41523861602, 290667031220, 2034669218546, 14242684529828, 99698791708802, 697891541961620, 4885240793731346, 34196685556119428 (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)+6, a(0)=2.

G.f.: ( 2+4*x ) / ( (7*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011

a(n) = 8*a(n-1) - 7*a(n-2). - Harvey P. Dale, Jan 27 2012

MATHEMATICA

3*7^Range[0, 20]-1 (* or *) LinearRecurrence[{8, -7}, {2, 20}, 20] (* Harvey P. Dale, Jan 27 2012 *)

PROG

(MAGMA) [3*7^n-1: n in [0..30]]

(PARI) a(n)=3*7^n-1 \\ Charles R Greathouse IV, Nov 21 2011

CROSSREFS

Sequence in context: A000183 A198052 A203216 * A081159 A105489 A093302

Adjacent sequences:  A198644 A198645 A198646 * A198648 A198649 A198650

KEYWORD

nonn,easy,less,changed

AUTHOR

Vincenzo Librandi, Oct 28 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 23 22:17 EST 2018. Contains 299595 sequences. (Running on oeis4.)