A076016 - OEIS

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A076016

Number of systems with n elements having with one binary operation satisfying the equation B(AB)=A (semisymmetric quasigroups).

1, 2, 3, 18, 120, 2880, 140256, 20782080, 9569532672 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Or, Latin squares with each row and column a permutation and corresponding rows and columns are inverse permutations.`
	CROSSREFS	`Cf. A076017-A076021.` `Sequence in context: A114165 A166510 A184719 * A107095 A102939 A073983` `Adjacent sequences: A076013 A076014 A076015 * A076017 A076018 A076019`
	KEYWORD	`nonn`
	AUTHOR	`Richard Schroeppel (rschroe(AT)sandia.gov), Oct 29 2002`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.