A258701 Number of non-isomorphic DST (directed triple system) quasigroups of order n.

0, 0, 1, 0, 0, 0, 2, 0, 4, 0, 0, 2, 1206969

Offset

1,7

Comments

a(n) = 0 if n == 2 (mod 3).

Links

Table of n, a(n) for n=1..13.

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

Sequence in context: A099894 A048298 A123565 * A246160 A081120 A200038

Adjacent sequences: A258698 A258699 A258700 * A258702 A258703 A258704

Keyword

nonn,more

Author

N. J. A. Sloane, Jun 07 2015

Status

approved