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A055127
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Triangle T(n,k) of numbers of proper k-covers of an unlabeled n-set, k=1..2^n-2.
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1
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0, 1, 0, 2, 5, 4, 2, 1, 0, 4, 19, 58, 113, 168, 193, 171, 119, 68, 29, 10, 3, 1, 0, 6, 53, 325, 1551, 6007, 19533, 54119, 128936, 266085, 478223, 751487, 1035609, 1254303, 1336855, 1254307, 1035622, 751526, 478320, 266272, 129226, 54484, 19898, 6297
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OFFSET
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2,4
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LINKS
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EXAMPLE
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[0, 1], [0, 2, 5, 4, 2, 1], [0, 4, 19, 58, 113, 168, 193, 171, 119, 68, 29, 10, 3, 1], ...; There are 113 proper 5-covers of an unlabeled 4-set.
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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