%I #10 Dec 19 2015 09:51:15
%S 0,0,0,0,0,0,3,6,0,4,96,214,128,64,38,54248,83925,54223,28254,10223,
%T 1894
%N Triangle: T(n,k), k<=n: commutative groupoids with a nontrivial symmetry with n elements and k idempotents.
%H <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a>
%F Difference of A038021 and A038022.
%Y Cf. A001329, A001425, A030259, A030262, A030265.
%K nonn,tabl,more
%O 0,7
%A _Christian G. Bower_, May 15 1998