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.
A076018
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.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =9a(6) =34a(7) =393a(8) =13980
External references
- oeis: A076018