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Number of self-converse semigroups of order n with 2 idempotents.
0

%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