login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A198766 (7*5^n-1)/2. 1
3, 17, 87, 437, 2187, 10937, 54687, 273437, 1367187, 6835937, 34179687, 170898437, 854492187, 4272460937, 21362304687, 106811523437, 534057617187, 2670288085937, 13351440429687, 66757202148437, 333786010742187, 1668930053710937 (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), n>1.

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

MATHEMATICA

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

LinearRecurrence[{6, -5}, {3, 17}, 30] (* Harvey P. Dale, Jan 23 2015 *)

PROG

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

CROSSREFS

Cf. A024049, A057651, A081655.

Sequence in context: A143549 A037794 A203851 * A240652 A204092 A221731

Adjacent sequences:  A198763 A198764 A198765 * A198767 A198768 A198769

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Oct 30 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 14 00:42 EDT 2021. Contains 342941 sequences. (Running on oeis4.)