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Search: id:A058133
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| A058133 |
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Number of monoids (semigroups with identity) of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator). |
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7
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| 1, 2, 6, 27, 156, 1373, 17730, 858977, 1844075697, 52991253973742
(list; graph; listen)
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