login
A193623
Number of nonisomorphic Knuthian systems of order n^2.
0
1, 1, 3, 44, 14022, 207392556, 193491859167624, 16390160979986065741152
OFFSET
1,3
COMMENTS
See the pdf file of the Curtis et al. reference for precise definition.
LINKS
Frank Curtis, John Drew, Chi-Kwong Li and Daniel Pragel, Central groupoids, central digraphs, and zero-one matrices A satisfying A^2 = J, Journal of Combinatorial Theory, Series A, Volume 105 Issue 1, (2004) pp. 35-50.
CROSSREFS
Sequence in context: A337249 A259785 A369944 * A102811 A307007 A142600
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 31 2011
STATUS
approved