OFFSET
1,1
COMMENTS
a(n) is always even.
LINKS
B. Dolan, D. MacHale and P. MacHale, Counting Commutativities in Finite Algebraic Systems, Irish Math. Soc. Bulletin, Number 77, Summer 2016, 61-70.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Des MacHale, Feb 05 2021
STATUS
approved