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A140922
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Number of 7 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 7,9,n can be permuted, see formula.
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0
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OFFSET
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0,2
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LINKS
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FORMULA
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(empirical) set p,q,r to n,9,7 (in any order) in s=p+q+r-1; a(n) = product {i in 0..r-1} (binomial(s,p+i)*i!/(s-i)^(r-i-1))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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