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Search: id:A139688
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| A139688 |
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Half the number of n X n binary matrices with row sum i equal to column sum i, i in 1..n. |
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+0
1
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| 1, 4, 40, 1216, 123776, 44030464, 56185705472, 261929007759360, 4520504755804536832
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