Number of isomorphism classes of closed binary operations (groupoids) on a set of order n, listed by class size.
A079171
Number of isomorphism classes of closed binary operations (groupoids) on a set of order n, listed by class size.
Terms
- a(0) =1a(1) =4a(2) =6a(3) =3a(4) =12a(5) =78a(6) =3237a(7) =2a(8) =1a(9) =14a(10) =30a(11) =275a(12) =495a(13) =48810a(14) =178932325
External references
- oeis: A079171