OFFSET
0,2
REFERENCES
P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 160, Sigma(Gamma_9, S_9; z).
LINKS
Colin Barker, Table of n, a(n) for n = 0..600
Index entries for linear recurrences with constant coefficients, signature (35,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-35,1).
FORMULA
G.f.: (1+x)*(1-x^18)/(1-35*x+35*x^18-x^19).
PROG
(PARI) Vec((1+x)*(1-x^18)/(1-35*x+35*x^18-x^19) + O(x^15)) \\ Colin Barker, Jun 13 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 21 2001
STATUS
approved