A058120 Number of self-converse semigroups of order n with 2 idempotents.

1, 5, 24, 123, 754, 6721

Offset

2,2

Links

Table of n, a(n) for n=2..7.

Index entries for sequences related to semigroups

Crossrefs

Column 2 of A058118.

Sequence in context: A163610 A055825 A006326 * A271544 A275267 A278679

Adjacent sequences: A058117 A058118 A058119 * A058121 A058122 A058123

Keyword

nonn,hard

Author

Christian G. Bower, Nov 10 2000

Status

approved