OFFSET
1,7
COMMENTS
a(n) = 0 if n == 2 (mod 3).
LINKS
Aleš Drápal, Terry S. Griggs, and Andrew R. Kozlik, Basics of DTS quasigroups: Algebra, geometry and enumeration Journal of Algebra and Its Applications, 14.06 (2015): 1550089.
Aleš Drápal, A. Kozlik, and Terry S. Griggs, Latin directed triple systems, Discrete Mathematics, 312.3 (2012): 597-607.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jun 07 2015
STATUS
approved