A058118 Triangle: self-converse semigroups of order n with k idempotents.
1, 2, 1, 5, 5, 2, 18, 24, 16, 6, 93, 123, 112, 58, 19, 930, 754, 764, 542, 254, 68, 22899, 6721, 5567, 4751, 2933, 1214, 285, 1937266, 123988, 49969, 41939, 31392, 17396, 6513, 1376, 613365656, 8265721, 739317, 410158, 328937, 223226, 113160, 38979, 7510
Offset: 1
Examples
1; 2,1; 5,5,2; 18,24,16,6; 93,123,112,58,19; ...
Links
- Andreas Distler, Classification and Enumeration of Finite Semigroups, A Thesis Submitted for the Degree of PhD, University of St Andrews (2010).
- Index entries for sequences related to semigroups
Extensions
More terms from Andreas Distler, Jan 13 2011