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A258701 Number of non-isomorphic DST (directed triple system) quasigroups of order n. 0
0, 0, 1, 0, 0, 0, 2, 0, 4, 0, 0, 2, 1206969 (list; graph; refs; listen; history; text; internal format)
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

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Last modified April 9 17:48 EDT 2020. Contains 333361 sequences. (Running on oeis4.)