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%I #5 Mar 30 2012 17:37:11
%S 1,1,1,1,3,1,2,9,6,2,1,28,31,18,6,2,131,160,132,65,19,1,1081,947,917,
%T 612,275,68,5
%N Triangle: Self-converse monoids of order n with k idempotents.
%H <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a>
%e 1; 1,1; 1,3,1; 2,9,6,2; 1,28,31,18,6; ...
%Y Row sums give A058132. Main diagonal: A058122(n-1). Columns 1-3: A000001, A058145, A058146.
%K nonn,tabl,more
%O 1,5
%A _Christian G. Bower_, Nov 14 2000
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