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A140937 Number of 5 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 5,11,n can be permuted, see formula. 0

%I

%S 1,4368,4504864,1837984512,381644355456,46960429261824,

%T 3792054662892288,216147115784860416,9183250377581777952,

%U 303282730418598205184,8048657076493567752960

%N Number of 5 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 5,11,n can be permuted, see formula.

%F (empirical) set p,q,r to n,11,5 (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 January 29 19:50 EST 2023. Contains 359926 sequences. (Running on oeis4.)