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A357767
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Number of n X n tables where rows represent distinct permutations of { 1, 2, ..., n } and the column sums are equal, up to permutation of rows.
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3
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) = the coefficient of (x1*...*xn)^(n*(n-1)/2) in Product(1 + x1^(n-1)*x2^(n-2)*...*xn^0), where the product is taken over all permutations of the variables x1, ..., xn.
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CROSSREFS
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KEYWORD
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hard,more,nonn
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AUTHOR
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STATUS
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approved
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