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A058170
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Triangle: Number of asymmetric semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
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0
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1, 2, 1, 3, 7, 2, 10, 28, 33, 7, 82, 153, 261, 213, 37, 2511, 1227, 2266, 2989, 1709, 263, 600106, 26033, 24176, 39176, 38346, 16306, 2134
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OFFSET
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1,2
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LINKS
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EXAMPLE
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1; 2,1; 3,7,2; 10,28,33,7; 82,153,261,213,37; ...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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