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

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A022111 Expansion of 1/((1-x)(1-5x)(1-6x)(1-8x)). 1
1, 20, 263, 2878, 28449, 264048, 2350651, 20332466, 172311557, 1438844836, 11885079999, 97387603014, 793247778025, 6432389826584, 51985193621507, 419076145997722, 3371967484999053, 27092843456412492 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Index to sequences with linear recurrences with constant coefficients, signature (20,-137,358,-240)

FORMULA

a(n) = 256*8^n/21 -108*6^n/5 + 125*5^n/12 -1/140. - R. J. Mathar, Mar 11 2011

a(0)=1, a(1)=20, a(2)=263, a(3)=2878, a(n)=20*a(n-1)-137*a(n-2)+ 358*a(n-3)- 240*a(n-4). - Harvey P. Dale, Nov 04 2012

MATHEMATICA

CoefficientList[Series[1/((1-x)(1-5x)(1-6x)(1-8x)), {x, 0, 30}], x] (* or *) LinearRecurrence[{20, -137, 358, -240}, {1, 20, 263, 2878}, 30] (* Harvey P. Dale, Nov 04 2012 *)

PROG

(MAGMA) I:=[1, 20, 263, 2878]; [n le 4 select I[n] else 20*Self(n-1)-137*Self(n-2)+358*Self(n-3)-240*Self(n-4): n in [1..25]]; /* or */ m:=25; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/((1-x)*(1-5*x)*(1-6*x)*(1-8*x)))); // Vincenzo Librandi, Jul 12 2013

CROSSREFS

Sequence in context: A081244 A025966 A041764 * A025943 A025961 A208948

Adjacent sequences:  A022108 A022109 A022110 * A022112 A022113 A022114

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

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 April 20 19:37 EDT 2014. Contains 240820 sequences.