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%I #3 Oct 03 2013 09:33:12
%S 1,924,226512,24293412,1447482465,55197331332,1478619421136,
%T 29706808370096,469699956117392,6062460972064640,65728947490132992,
%U 612416828057104512,4995284546047230864,36217696550300209296,236405501218419838800,1404221840699607829900
%N Number of 6 X 6 matrices with elements in 0..n with each row and each column in nondecreasing order. 6,6,n can be permuted, see formula.
%F (empirical) set p,q,r to n,6,6 (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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