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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
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Index entries for sequences related to semigroups
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EXAMPLE
| 1; 2,1; 3,5,1; 7,18,12,2; 24,65,73,34,5; ...
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CROSSREFS
| Row sums give A058105.
Sequence in context: A062705 A059234 A120852 * A058169 A178074 A002249
Adjacent sequences: A058165 A058166 A058167 * A058169 A058170 A058171
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KEYWORD
| nonn,tabl,hard
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net), Nov 19 2000
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