OFFSET
0,3
COMMENTS
a(n) is the number of ordered n-tuples of involutions on [n] that pairwise commute. Two involutions x,y on [n] commute if x*y = y*x.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..50
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, May 06 2023
STATUS
approved