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Number of 3*n X n 0..2 arrays with row sums 3 and column sums 9
1

%I #4 Mar 31 2012 12:35:40

%S 0,20,1376095,1252634243520,8432855707512236000,

%T 297155971199028097720850000,42758542523186088601256526892620000,

%U 20877662827076969301744211245461828236480000

%N Number of 3*n X n 0..2 arrays with row sums 3 and column sums 9

%H R. H. Hardin, <a href="/A172669/b172669.txt">Table of n, a(n) for n=1..23</a>

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 06 2010