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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A066280 1^n + 2^(n+1) + 3^(n+2). 2
5, 12, 32, 90, 260, 762, 2252, 6690, 19940, 59562, 178172, 533490, 1598420, 4791162, 14365292, 43079490, 129205700, 387551562, 1162523612, 3487308690, 10461401780, 31383156762, 94147373132, 282437925090, 847305386660 (list; graph; refs; listen; history; text; internal format)
OFFSET

-1,1

LINKS

Harry J. Smith, Table of n, a(n) for n=-1,...,200

Index entries for linear recurrences with constant coefficients, signature (6, -11, 6).

FORMULA

1 + A000079(n) + A000244(n+1)

a(n)= 6*a(n-1) -11*a(n-2) +6*a(n-3). G.f.: (-18*x+15*x^2+5)/((1-x) * (3*x-1) * (2*x-1) * x). [From R. J. Mathar, Feb 19 2010]

MATHEMATICA

Table[ 1^(n + 1) + 2^(n + 2) + 3^(n + 3), {n, -2, 24} ]

PROG

(PARI) { for (n=-1, 200, write("b066280.txt", n, " ", 1^n + 2^(n + 1) + 3^(n + 2)) ) } [From Harry J. Smith, Feb 08 2010]

CROSSREFS

Sequence in context: A090974 A038606 A192303 * A192243 A136113 A050189

Adjacent sequences:  A066277 A066278 A066279 * A066281 A066282 A066283

KEYWORD

nonn

AUTHOR

George E. Antoniou (george.antoniou(AT)montclair.edu), Dec 10 2001

EXTENSIONS

More terms from Robert G. Wilson v, Dec 11 2001

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 December 6 06:58 EST 2016. Contains 278775 sequences.