login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A120471 a(n) = 6 * A015518(n). 1
0, 6, 12, 42, 120, 366, 1092, 3282, 9840, 29526, 88572, 265722, 797160, 2391486, 7174452, 21523362, 64570080, 193710246, 581130732, 1743392202, 5230176600, 15690529806, 47071589412, 141214768242, 423644304720, 1270932914166 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(n) = 2*a(n-1)+3*a(n-2).
G.f.: 6*x/(1-2*x-3*x^2). - Colin Barker, Jan 29 2012
MATHEMATICA
LinearRecurrence[{2, 3}, {0, 6}, 30] (* Harvey P. Dale, Jun 09 2017 *)
CROSSREFS
Cf. A015518.
Sequence in context: A060551 A129113 A048025 * A219522 A034529 A121160
KEYWORD
nonn,easy,less,changed
AUTHOR
EXTENSIONS
Edited by N. J. A. Sloane, Dec 04 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 4 01:40 EST 2024. Contains 370522 sequences. (Running on oeis4.)