%I #6 Mar 30 2012 17:37:11
%S 1,1,3,12,78,746,10965,746277
%N Number of asymmetric semigroups of order n, 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>
%Y Cf. A001423.
%K nonn,hard
%O 0,3
%A _Christian G. Bower_, Nov 09 2000
%E Updated Feb 19 2001