%I
%S 1,2,1,3,5,1,7,18,12,2,24,65,73,34,5,133,276,399,309,123,18,1722,1595,
%T 2240,2331,1500,544,81
%N Triangle: Number of asymmetric commutative semigroups of order n with k idempotents.
%H <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a>
%e 1; 2,1; 3,5,1; 7,18,12,2; 24,65,73,34,5; ...
%Y Row sums give A058105.
%K nonn,tabl,hard
%O 1,2
%A _Christian G. Bower_, Nov 19 2000
