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A063815 Growth series for fundamental group of orientable closed surface of genus 5. 0
1, 20, 380, 7220, 137180, 2606420, 49521980, 940917620, 17877434780, 339671260820, 6453753955560, 122621325155260, 2329805177942740, 44266298380775260, 841059669232130740, 15980133715361099260, 303622540590922574740 (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. 160, Sigma(Gamma_5, S_5; z).

LINKS

Table of n, a(n) for n=0..16.

FORMULA

G.f.: (1+x)*(1-x^10)/(1-19*x+19*x^10-x^11).

CROSSREFS

Sequence in context: A164911 A165348 A165882 * A166414 A166601 A167073

Adjacent sequences:  A063812 A063813 A063814 * A063816 A063817 A063818

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 21 2001

STATUS

approved

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Last modified May 25 01:44 EDT 2019. Contains 323534 sequences. (Running on oeis4.)