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A140942 Number of 10 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 10,11,n can be permuted, see formula. 0

%I

%S 1,352716,20734762776,359423289546776,2464759032039691296,

%T 8048657076493567752960

%N Number of 10 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 10,11,n can be permuted, see formula.

%F (empirical) set p,q,r to n,11,10 (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))

%K nonn

%O 0,2

%A _R. H. Hardin_, Jul 05 2008

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Last modified August 9 09:54 EDT 2022. Contains 356021 sequences. (Running on oeis4.)