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 A140938 Number of 6 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 6,11,n can be permuted, see formula. 0

%I

%S 1,12376,32821152,31803696288,14675134144320,3792054662892288,

%T 612416828057104512,66906538465238667936,5247874388850386800416,

%U 309490028060407426691200

%N Number of 6 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 6,11,n can be permuted, see formula.

%F (empirical) set p,q,r to n,11,6 (in any order) in s=p+q+r-1; a(n) = Product {i=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 December 8 01:51 EST 2022. Contains 358672 sequences. (Running on oeis4.)