A058119 Number of self-converse semigroups of order n with 1 idempotent.

1, 2, 5, 18, 93, 930, 22899

Offset

1,2

Links

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

Index entries for sequences related to semigroups

Crossrefs

Column 1 of A058118.

Sequence in context: A143522 A217389 A123310 * A335547 A367012 A075441

Adjacent sequences: A058116 A058117 A058118 * A058120 A058121 A058122

Keyword

nonn,hard

Author

Christian G. Bower, Nov 10 2000

Status

approved