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A147872
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Number of consistent sets of 7 irreflexive binary order relationships over n objects.
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8
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6540, 496680, 10931760, 124318112, 934536600, 5284309680, 24238001040, 94622473440, 324833152644, 1003729086360, 2840342968320, 7458732665280, 18365400613040, 42754133712096, 94739078371680, 200943535287360, 409861294271100, 807103156903560, 1539611666989968
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OFFSET
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5,1
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LINKS
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FORMULA
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a(n) = (n-4)*(n-3)*(n-2)*(n-1)*n*(n^9 + 3*n^8 - 26*n^7 - 168*n^6 - 259*n^5 + 1743*n^4 + 15044*n^3 + 40722*n^2 - 111060*n - 817320)/5040. - Vaclav Kotesovec, Apr 11 2020
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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