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).