A193623 Number of nonisomorphic Knuthian systems of order n^2.

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

Table of n, a(n) for n=1..8.

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.

F. Curtis, J. Drew, Central groupoids, central digraphs, and zero-one matrices A satisfying A^2=J, (2002), expanded version.

Crossrefs

Sequence in context: A337249 A259785 A369944 * A102811 A307007 A142600

Adjacent sequences: A193620 A193621 A193622 * A193624 A193625 A193626

Keyword

nonn

Author

N. J. A. Sloane, Jul 31 2011

Status

approved