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!)
A155604 6^n+3^n-1. 10
1, 8, 44, 242, 1376, 8018, 47384, 282122, 1686176, 10097378, 60525224, 362974202, 2177313776, 13062288338, 78368947064, 470199333482, 2821152954176, 16926788584898, 101560344088904, 609360902271962, 3656161926847376 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

Index entries for linear recurrences with constant coefficients, signature (10,-27,18).

FORMULA

G.f.: 1/(1-6*x)+1/(1-3*x)-1/(1-x). E.g.f.: e^(6*x)+e^(3*x)-e^x.

a(n)=9*a(n-1)-18*a(n-2)-10 with a(0)=1, a(1)=8 - Vincenzo Librandi, Jul 21 2010

PROG

(PARI) a(n)=6^n+3^n-1 \\ Charles R Greathouse IV, Jun 11 2015

CROSSREFS

Cf. A074501, A020515, A155588, A155590, A155592, A155593, A155594, A155596, A155597, A155598, A155599, A155600, A155601, A155602, A155603.

Sequence in context: A249794 A322498 A147828 * A126476 A220629 A210118

Adjacent sequences:  A155601 A155602 A155603 * A155605 A155606 A155607

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian, Jan 25 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 28 07:38 EDT 2020. Contains 337394 sequences. (Running on oeis4.)