%I #6 Mar 30 2012 17:37:11
%S 1,5,24,123,754,6721
%N Number of self-converse semigroups of order n with 2 idempotents.
%H <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a>
%Y Column 2 of A058118.
%K nonn,hard
%O 2,2
%A _Christian G. Bower_, Nov 10 2000