Number of isomorphism classes of associative closed binary operations (semigroups) on a set of order n, listed by class size.
A079175
Number of isomorphism classes of associative closed binary operations (semigroups) on a set of order n, listed by class size.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =2a(5) =0a(6) =7a(7) =15a(8) =2a(9) =0a(10) =0a(11) =7a(12) =5a(13) =0a(14) =62a(15) =112a(16) =2a(17) =0a(18) =0a(19) =0a(20) =6a(21) =0a(22) =0a(23) =8a(24) =0a(25) =2a(26) =51a(27) =0a(28) =47a(29) =2
External references
- oeis: A079175