%I #6 Mar 30 2012 17:37:12
%S 1,2,1,3,7,2,10,28,33,7,82,153,261,213,37,2511,1227,2266,2989,1709,
%T 263,600106,26033,24176,39176,38346,16306,2134
%N Triangle: Number of asymmetric semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
%H <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a>
%e 1; 2,1; 3,7,2; 10,28,33,7; 82,153,261,213,37; ...
%Y Row sums give A058107.
%K nonn,tabl,hard
%O 1,2
%A _Christian G. Bower_, Nov 19 2000