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%I #6 Mar 30 2012 17:37:11
%S 1,1,1,1,3,2,2,9,10,6,1,30,47,52,26,2,175,283,413,365,135,1,3333,2139,
%T 3630,4597,3155,875,5
%N Triangle read by rows: number of monoids 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/Mo#monoids">Index entries for sequences related to monoids</a>
%e 1; 1,1; 1,3,2; 2,9,10,6; 1,30,47,52,26; ...
%Y Row sums give A058133. Main diagonal: A002788(n-1). Columns 1-3: A000001, A058148, A058149.
%K nonn,tabl,more
%O 1,5
%A _Christian G. Bower_, Nov 14 2000
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