OFFSET
0,2
COMMENTS
This is the number of words of length 2n equal to the identity in the letters t, t^{-1}, a, a^{-1} which generate the Brin-Navas group B.
LINKS
Andrew Elvey Price, Table of n, a(n) for n = 0..126
Andrew Elvey Price and A. J. Guttmann, Numerical studies of Thompson's group F and related groups, arXiv:1706.07571 [math.GR], 2017.
EXAMPLE
For n=1 there are 4 words of length 2 equal to the identity: aa^{-1}, a^{-1}a, tt^{-1}, t^{-1}t.
CROSSREFS
KEYWORD
nonn,walk
AUTHOR
Andrew Elvey Price, Jan 11 2023
STATUS
approved