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%I #3 Oct 03 2013 09:33:11
%S 1,210,13860,457380,9343620,133613766,1447482465,12544848030,
%T 90474964580,559299781040,3031952379456,14675134144320,64344818940480,
%U 258616676126160,962206162645860,3341308066756506,10904939897954025,33648885753232750,98669664990682500
%N Number of 4 X 6 matrices with elements in 0..n with each row and each column in nondecreasing order. 4,6,n can be permuted, see formula.
%F (empirical) set p,q,r to n,6,4 (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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