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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A063823 G.f.: (1-2*x^2-3*x^3)/((1-x^3)*(1-2*x)) 0
1, 2, 2, 2, 4, 6, 10, 20, 38, 74, 148, 294, 586, 1172, 2342, 4682, 9364, 18726, 37450, 74900, 149798, 299594, 599188, 1198374, 2396746, 4793492, 9586982, 19173962, 38347924, 76695846, 153391690, 306783380, 613566758, 1227133514 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 259.

LINKS

Table of n, a(n) for n=0..33.

Index entries for linear recurrences with constant coefficients, signature (2,0,1,-2).

CROSSREFS

Sequence in context: A064355 A000799 A185030 * A182027 A005865 A176051

Adjacent sequences:  A063820 A063821 A063822 * A063824 A063825 A063826

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Aug 21 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 November 19 11:04 EST 2017. Contains 294936 sequences.