id:A076020 - OEIS Search Results

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Number of systems with n elements having with one binary operation satisfying the equation B(AB)=A (semisymmetric quasigroups). This gives numbers of systems which are isomorphic to their transpose but are noncommutative.

+0
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0, 0, 0, 1, 3, 6, 24, 178, 1328 (list; graph; listen)

	OFFSET	`1,5`
	CROSSREFS	`Cf. A076016-A076021.` `Sequence in context: A109155 A081072 A000717 this_sequence A018964 A018994 A117850` `Adjacent sequences: A076017 A076018 A076019 this_sequence A076021 A076022 A076023`
	KEYWORD	`nonn`
	AUTHOR	`Richard Schroeppel (rschroe(AT)sandia.gov), Oct 29 2002`

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Last modified September 4 21:24 EDT 2008. Contains 143414 sequences.

AT&T Labs Research