OFFSET
1,7
COMMENTS
a(n) = 0 whenever n == 2 (mod 3).
a(n) is also the number of unipotent semisymmetric quasigroups of order n+1 and is also the number of semisymmetric loops of order n+1.
LINKS
Brendan D. McKay and Ian M. Wanless, Enumeration of Latin squares with conjugate symmetry, J. Combin. Des. 30 (2022), 105-130.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Richard C. Schroeppel, Oct 29 2002
EXTENSIONS
a(10)-a(12) from Ian Wanless, Dec 08 2021
STATUS
approved