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

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A013723 18^(2n+1). 3
18, 5832, 1889568, 612220032, 198359290368, 64268410079232, 20822964865671168, 6746640616477458432, 2185911559738696531968, 708235345355337676357632, 229468251895129407139872768 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (324).

FORMULA

a(n)=324*a(n-1), n>0 ; a(0)=18 . G.f.: 18/(1-324*x). - Philippe Deléham, Nov 28 2008

MAPLE

seq(18^(2*n+1), n=0..10); # Nathaniel Johnston, Jun 25 2011

PROG

(MAGMA) [18^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011

(PARI) a(n)=18^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016

CROSSREFS

Cf. A013708-A013722, A013724-A013729.

Sequence in context: A036214 A188799 A058976 * A232595 A159405 A265450

Adjacent sequences:  A013720 A013721 A013722 * A013724 A013725 A013726

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

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 August 21 09:54 EDT 2017. Contains 290864 sequences.