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Search: id:A063809
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| A063809 |
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Spherical growth series for pair of groups, one Gromov hyperbolic, the other not. |
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+0
1
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| 1, 108, 2160, 40176, 743040, 13735872, 253912320, 4693641984, 86763294720, 1603843918848, 29647506124800, 548042492768256, 10130719683870720, 187269203879903232, 3461723926449684480, 63990940820356399104, 1182890546466536816640
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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W. Floyd and W. Parry, The growth of nonpositively curved triangles of groups, Invent. math., 129 (1997), 289-359.
P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 154.
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FORMULA
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G.f.: (1+88*x+28*x^2)/(1-20*x+28*x^2).
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CROSSREFS
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Sequence in context: A101213 A096953 A115135 this_sequence A138784 A035812 A054624
Adjacent sequences: A063806 A063807 A063808 this_sequence A063810 A063811 A063812
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KEYWORD
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nonn
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AUTHOR
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njas, Aug 20 2001
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