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Number of 3*n X n 0..7 arrays with row sums 7 and column sums 21
1

%I #4 Mar 31 2012 12:35:42

%S 1,18152,513799394688,3453235602818369547520,

%T 1835784677576057001102381224194900,

%U 37246115504386074787217299933684238287194514560

%N Number of 3*n X n 0..7 arrays with row sums 7 and column sums 21

%H R. H. Hardin, <a href="/A172936/b172936.txt">Table of n, a(n) for n=1..10</a>

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 06 2010