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Search: id:A058108
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| A058108 |
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Triangle read by rows: semigroups of order n with k idempotents. |
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+0
8
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| 1, 2, 3, 5, 9, 10, 20, 50, 72, 46, 171, 309, 590, 594, 251, 5284, 2806, 5422, 7772, 5668, 1682, 1224331, 58583, 61323, 101539, 109107, 59576, 13213
(list; table; graph; listen)
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OFFSET
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1,2
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LINKS
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Index entries for sequences related to semigroups
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EXAMPLE
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1; 2,3; 5,9,10; 20,50,72,46; 171,309,590,594,251; ...
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CROSSREFS
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Row sums give A027851. Main diagonal: A058112. Columns 1-3: A058109-A058111.
Sequence in context: A057254 A057242 A090845 this_sequence A056144 A078645 A067139
Adjacent sequences: A058105 A058106 A058107 this_sequence A058109 A058110 A058111
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KEYWORD
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nonn,tabl,hard
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Nov 09 2000
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EXTENSIONS
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Updated Feb 19 2001
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