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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A137223 A135574(3n)+A135574(3n+1)+A135574(3n+2). 0
3, 18, 234, 1110, 15018, 70998, 961194, 4543830, 61516458, 290805078, 3937053354, 18611524950, 251971414698, 1191137596758, 16126170540714, 76232806192470, 1032074914605738, 4878899596318038, 66052794534767274, 312249574164354390 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n)= -a(n-1)+64*a(n-2)+64*a(n-3) = -2*(-1)^n/3+35*8^n/12+3*(-8)^n/4. G.f.: 3(1+7x+20x^2)/((1-8x)(1+8x)(1+x)). [From R. J. Mathar, Feb 07 2009]

CROSSREFS

Sequence in context: A195767 A195763 A265460 * A159640 A038061 A232916

Adjacent sequences:  A137220 A137221 A137222 * A137224 A137225 A137226

KEYWORD

nonn

AUTHOR

Paul Curtz, Mar 07 2008

EXTENSIONS

More terms from R. J. Mathar, Feb 07 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 November 13 12:45 EST 2019. Contains 329094 sequences. (Running on oeis4.)