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A038018
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Triangle: T(n,k), k<=n: groupoids with n elements and k idempotents.
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3
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1, 0, 1, 3, 4, 3, 978, 1485, 729, 138, 56630832, 75503872, 37755904, 8390656, 700688, 813802235250650, 1017252851596875
(list; table; graph; refs; listen; history; internal format)
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