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A076019 Number of nonisomorphic commutative systems with n elements having with one binary operation satisfying the equation B(AB)=A (semisymmetric quasigroups). 0

%I

%S 1,1,2,2,1,3,3,13,12

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

%Y Cf. A076016-A076021.

%K nonn,hard,more

%O 1,3

%A Richard C. Schroeppel, Oct 29 2002

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Last modified October 21 18:41 EDT 2020. Contains 337919 sequences. (Running on oeis4.)