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A193623
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Number of nonisomorphic Knuthian systems of order n^2.
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0
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OFFSET
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1,3
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COMMENTS
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See the pdf file of the Curtis et al. reference for precise definition.
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LINKS
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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.
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CROSSREFS
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Sequence in context: A011916 A337249 A259785 * A102811 A307007 A142600
Adjacent sequences: A193620 A193621 A193622 * A193624 A193625 A193626
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Jul 31 2011
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STATUS
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approved
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