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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A120950 3^n+5^n-2n. 1
2, 6, 30, 146, 698, 3358, 16342, 80298, 397170, 1972790, 9824654, 49005250, 244672042, 1222297422, 6108298566, 30531927002, 152630937314, 763068593254, 3815084686078, 19074648589554, 95370918424986, 476847618556286 (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 (10,-32,38,-15).

FORMULA

G.f.: 2*(1-7*x+17*x^2-19*x^3)/((1-5*x)*(1-3*x)*(1-x)^2). - Vincenzo Librandi, Feb 26 2013

MATHEMATICA

Table[3^n + 5^n - 2 n, {n, 0, 30}] (* or *) CoefficientList[Series[2 (1 - 7 x + 17 x^2 - 19 x^3)/((1 - 5 x) (1 - 3 x) (1 - x)^2), {x, 0, 30}], x] (* Vincenzo Librandi, Feb 26 2013 *)

LinearRecurrence[{10, -32, 38, -15}, {2, 6, 30, 146}, 30] (* Harvey P. Dale, Apr 27 2016 *)

PROG

(MAGMA) [3^n+5^n-2*n: n in [0..30]]; // Vincenzo Librandi, Feb 27 2013

CROSSREFS

Cf. A074606, A005058.

Sequence in context: A073969 A295863 A224530 * A055695 A113593 A122763

Adjacent sequences:  A120947 A120948 A120949 * A120951 A120952 A120953

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian, Aug 19 2006

EXTENSIONS

Edited by Ray Chandler, Sep 06 2006

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 December 15 09:05 EST 2019. Contains 329995 sequences. (Running on oeis4.)