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Search: id:A058123
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| A058123 |
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Triangle: 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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6
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| 1, 2, 2, 5, 7, 6, 19, 37, 44, 26, 132, 216, 351, 326, 135, 3107, 1780, 3093, 4157, 2961, 875, 623615, 32652, 33445, 53145, 56020, 30395, 6749
(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; 2,2; 5,7,6; 19,37,44,26; 132,216,351,326,135; ...
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CROSSREFS
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Row sums give A001423. Main diagonal: A002788. Columns 1-3: A002787, A002788, A005591.
Sequence in context: A136536 A023507 A095674 this_sequence A035586 A097050 A095295
Adjacent sequences: A058120 A058121 A058122 this_sequence A058124 A058125 A058126
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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 10 2000
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