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A038020
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Triangle: T(n,k), k<=n: groupoids with a nontrivial symmetry with n elements and k idempotents.
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1
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0, 0, 0, 2, 0, 2, 9, 54, 0, 30, 15376, 12664, 14304, 4096, 3187
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OFFSET
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0,4
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins:
0;
0, 0;
2, 0, 2;
9, 54, 0, 30;
15376, 12664, 14304, 4096, 3187;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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