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A058168
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Triangle: Number of asymmetric commutative semigroups of order n with k idempotents.
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1
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1, 2, 1, 3, 5, 1, 7, 18, 12, 2, 24, 65, 73, 34, 5, 133, 276, 399, 309, 123, 18, 1722, 1595, 2240, 2331, 1500, 544, 81
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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; 3,5,1; 7,18,12,2; 24,65,73,34,5; ...
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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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