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Search: id:A140190
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| A140190 |
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a(n) is the number of groupoids (categories all of whose morphisms are invertible) with m morphisms and m-n objects for any m>=2n. |
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2
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| 1, 1, 3, 5, 9, 15, 27, 44, 71, 113, 176, 271, 413, 621, 927, 1375, 2004, 2924, 4213
(list; graph; listen)
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