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Search: id:A058170
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| A058170 |
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Triangle: Number of asymmetric 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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+0
1
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| 1, 2, 1, 3, 7, 2, 10, 28, 33, 7, 82, 153, 261, 213, 37, 2511, 1227, 2266, 2989, 1709, 263, 600106, 26033, 24176, 39176, 38346, 16306, 2134
(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; 2,1; 3,7,2; 10,28,33,7; 82,153,261,213,37; ...
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CROSSREFS
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Row sums give A058107.
Sequence in context: A125889 A116381 A073901 this_sequence A127896 A010757 A019320
Adjacent sequences: A058167 A058168 A058169 this_sequence A058171 A058172 A058173
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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 19 2000
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