OFFSET
0,2
COMMENTS
Decimal expansion of 223/1500. - Elmo R. Oliveira, May 05 2024
REFERENCES
P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 152.
Avinoam Mann, How Groups Grow, London Mathematical Society Lecture Note Series, Vol. 335, Cambridge University Press, 2012; ISBN: 1107657504,9781107657502. See Example 6, page 3.
P. Wagreich, The growth function of a discrete group (Lecture Notes in Mathematics, Vol. 956, Group Actions and Vector Fields, 1982, Vol. 956, pp. 125-144). Springer Berlin Heidelberg. See Example (3.2).
LINKS
FORMULA
G.f.: (1+3*x+4*x^2-2*x^3)/(1-x).
a(n) = 6 for n >= 3. - Elmo R. Oliveira, May 05 2024
E.g.f.: 6*exp(x) - 5 - 2*x + x^2. - Elmo R. Oliveira, Aug 09 2024
MATHEMATICA
PadRight[{1, 4, 8}, 100, 6] (* Paolo Xausa, Nov 14 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 20 2001
STATUS
approved