A140939 - OEIS

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A140939

Number of 7 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 7,11,n can be permuted, see formula.

%I

%S 1,31824,200443464,431621592480,418241323113120,216147115784860416,

%T 66906538465238667936,13494534142758137486784

%N Number of 7 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 7,11,n can be permuted, see formula.

%F (empirical) set p,q,r to n,11,7 (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))

%K nonn

%O 0,2

%A _R. H. Hardin_, Jul 05 2008

Last modified January 18 19:59 EST 2021. Contains 340262 sequences. (Running on oeis4.)