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A063808 Spherical growth series of Z with respect to {2, 3}. 0
1, 4, 8, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

REFERENCES

P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 152.

FORMULA

G.f.: (1+3*x+4*x^2-2*x^3)/(1-x).

CROSSREFS

Sequence in context: A198885 A177157 A201527 * A081455 A197290 A200368

Adjacent sequences:  A063805 A063806 A063807 * A063809 A063810 A063811

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Aug 20 2001

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Last modified February 17 16:13 EST 2012. Contains 206050 sequences.