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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A072259 ((6n+37)*4^n-1)/3. 4
12, 57, 261, 1173, 5205, 22869, 99669, 431445, 1856853, 7951701, 33903957, 144004437, 609572181, 2572506453, 10826896725, 45455070549, 190410216789, 796000605525, 3321441375573 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Related to Collatz function (for n>0). All divisible by 3.

LINKS

Table of n, a(n) for n=0..18.

Index to sequences with linear recurrences with constant coefficients, signature (9,-24,16).

FORMULA

G.f.: 3*(4-17*x+12*x^2)/((1-x)*(1-4*x)^2). - Bruno Berselli, Dec 16 2011

CROSSREFS

Cf. A072257, A072258, A072260.

Sequence in context: A212065 A121693 A190297 * A242983 A167533 A244907

Adjacent sequences:  A072256 A072257 A072258 * A072260 A072261 A072262

KEYWORD

nonn,easy

AUTHOR

N. Rathankar (rathankar(AT)yahoo.com), Jul 08 2002

EXTENSIONS

Edited and extended by Henry Bottomley, Aug 06 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified December 20 15:14 EST 2014. Contains 252266 sequences.