A058109 Semigroups of order n with 1 idempotent.

1, 2, 5, 20, 171, 5284, 1224331

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Index entries for sequences related to semigroups

Crossrefs

Column 1 of A058108.

Sequence in context: A184730 A181076 A156871 * A005331 A261005 A158872

Adjacent sequences: A058106 A058107 A058108 * A058110 A058111 A058112

Keyword

nonn,hard

Author

Christian G. Bower, Nov 09 2000

Extensions

Updated Feb 19 2001

Status

approved