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A038022
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Triangle: T(n,k), k<=n: commutative groupoids with no symmetry with n elements and k idempotents.
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1
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1, 0, 1, 1, 2, 1, 35, 51, 27, 3, 13776, 18330, 9152, 2016, 164, 83306272, 104124850, 52056277, 13006746, 1622527, 80461
(list; table; graph; refs; listen; history; internal format)
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