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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

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Last modified March 27 13:47 EDT 2017. Contains 284176 sequences.