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%I #6 Mar 30 2012 17:37:11
%S 1,3,9,28,131,1081
%N Number of self-converse monoids of order n with 2 idempotents.
%H <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a>
%Y Column 2 of A058144.
%K nonn,more
%O 2,2
%A _Christian G. Bower_, Nov 14 2000