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

%I #6 Mar 30 2012 17:37:11

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

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

%H <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a>

%Y Column 1 of A058118.

%K nonn,hard

%O 1,2

%A _Christian G. Bower_, Nov 10 2000