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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A078055 Expansion of (1-x)/(1+2*x-2*x^2+2*x^3). 0
1, -3, 8, -24, 70, -204, 596, -1740, 5080, -14832, 43304, -126432, 369136, -1077744, 3146624, -9187008, 26822752, -78312768, 228645056, -667561152, 1949037952, -5690488320, 16614174848, -48507402240, 141624130816, -413491415808, 1207245897728, -3524722888704, 10290920404480 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..28.

Index entries for linear recurrences with constant coefficients, signature (-2, 2, -2).

FORMULA

a(0)=1, a(1)=-3, a(2)=8, a(n)=-2*a(n-1)+2*a(n-2)-2*a(n-3). - Harvey P. Dale, Mar 06 2013

MATHEMATICA

CoefficientList[Series[(1-x)/(1+2x-2x^2+2x^3), {x, 0, 50}], x] (* or *) LinearRecurrence[{-2, 2, -2}, {1, -3, 8}, 50] (* Harvey P. Dale, Mar 06 2013 *)

CROSSREFS

Sequence in context: A297219 A018046 A095125 * A291613 A238126 A079121

Adjacent sequences:  A078052 A078053 A078054 * A078056 A078057 A078058

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Nov 17 2002

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 November 19 08:57 EST 2018. Contains 317348 sequences. (Running on oeis4.)