OFFSET
0,2
COMMENTS
a(n) is the number of words of length 2n in the letters a,a^(-1),t,t^(-1) that equal the identity of the group Z wr Z = <a,t | [a,t^(-k)at^k]=1 for all k >.
LINKS
Andrew Elvey Price, Table of n, a(n) for n = 0..500
Andrew Elvey Price and A. J. Guttmann, Numerical studies of Thompson's group F and related groups, arXiv:1706.07571 [math.GR], 2017.
C. Pittet and L. Saloff-Coste, On random walks on wreath products, The annals of probability, 30 No. 2 (2002), 948-977.
Wikipedia, Wreath product
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Elvey Price, Jan 13 2023
STATUS
approved