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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155588 5^n+2^n-1^n. 29
1, 6, 28, 132, 640, 3156, 15688, 78252, 390880, 1953636, 9766648, 48830172, 244144720, 1220711316, 6103532008, 30517610892, 152587956160, 762939584196, 3814697527768, 19073486852412, 95367432689200, 476837160300276 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

Index entries for linear recurrences with constant coefficients, signature (8,-17,10).

FORMULA

G.f.: 1/(1-5*x)+1/(1-2*x)-1/(1-x). E.g.f.: e^(5*x)+e^(2*x)-e^x.

a(n)=7*a(n-1)-10*a(n-2)-4 with a(0)=1, a(1)=6 - Vincenzo Librandi, Jul 21 2010

PROG

(PARI) a(n)=5^n+2^n-1 \\ Charles R Greathouse IV, Sep 24 2015

CROSSREFS

Cf. A074501, A074600, A005057, A005056, A099393.

Sequence in context: A171859 A084778 A287807 * A208439 A108051 A199315

Adjacent sequences:  A155585 A155586 A155587 * A155589 A155590 A155591

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian, Jan 24 2009

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 18 13:07 EST 2018. Contains 299322 sequences. (Running on oeis4.)