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A058142
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Triangle read by rows: number of commutative monoids of order n with k idempotents.
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6
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1, 1, 1, 1, 3, 1, 2, 9, 6, 2, 1, 26, 30, 16, 5, 1, 98, 142, 111, 54, 15, 1, 455, 718, 713, 482, 215, 53, 3, 4018, 4277, 4637, 3919, 2414, 996, 222, 2, 101910, 36124, 32937, 31308, 24047, 13758, 5294, 1078, 1, 10054303, 708355, 290278, 260758, 229411, 164216, 88178, 31867, 5994
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OFFSET
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1,5
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LINKS
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EXAMPLE
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Triangle begins:
1;
1, 1;
1, 3, 1;
2, 9, 6, 2;
1, 26, 30, 16, 5;
1, 98, 142, 111, 54, 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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