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%I #11 Dec 09 2021 00:48:04
%S 1,1,2,3,4,9,34,393,13980
%N Number of systems with n elements with one binary operation satisfying the equation B(AB)=A (semisymmetric quasigroups). Isomorphic systems and systems differing by a transposition have been omitted.
%Y Cf. A076016-A076021.
%K nonn,hard,more
%O 1,3
%A Richard C. Schroeppel, Oct 29 2002