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A063820
Growth series for fundamental group of orientable closed surface of genus 10.
2
1, 40, 1560, 60840, 2372760, 92537640, 3608967960, 140749750440, 5489240267160, 214080370419240, 8349134446350360, 325616243407664040, 12699033492898897560, 495262306223057004840, 19315229942699223188760, 753293967765269704361640
OFFSET
0,2
REFERENCES
P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 160, Sigma(Gamma_10, S_10; z).
LINKS
Index entries for linear recurrences with constant coefficients, signature (39,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-39,1).
FORMULA
G.f.: (1+x)*(1-x^20)/(1-39*x+39*x^20-x^21).
PROG
(PARI) Vec((1+x)*(1-x^20)/(1-39*x+39*x^20-x^21) + O(x^15)) \\ Colin Barker, Jun 13 2019
CROSSREFS
Sequence in context: A170625 A170673 A170721 * A170759 A218742 A158703
KEYWORD
easy,nonn
AUTHOR
N. J. A. Sloane, Aug 21 2001
STATUS
approved