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A058169
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Triangle: Number of asymmetric self-converse semigroups of order n with k idempotents.
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0
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1, 2, 1, 3, 5, 1, 9, 19, 14, 2, 52, 82, 88, 43, 6, 624, 470, 556, 410, 162, 24, 19027, 4444, 3771, 3501, 2088, 731, 110
(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; 9,19,14,2; 52,82,88,43,6; ...
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CROSSREFS
| Row sums give A058106.
Sequence in context: A059234 A120852 A058168 * A178074 A002249 A157127
Adjacent sequences: A058166 A058167 A058168 * A058170 A058171 A058172
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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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