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A058116
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Triangle read by rows: T(n,k) is the number of isomorphism classes of commutative semigroups of order n with k idempotents.
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6
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1, 2, 1, 5, 5, 2, 16, 23, 14, 5, 62, 106, 93, 49, 15, 342, 544, 582, 422, 200, 53, 3435, 3380, 3773, 3360, 2178, 943, 222, 97061, 30788, 27222, 26625, 21283, 12676, 5072, 1078
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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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Triangle begins:
1;
2, 1;
5, 5, 2;
16, 23, 14, 5;
62, 106, 93, 49, 15;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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