%I #4 Mar 31 2012 12:35:41

%S 0,0,21,20112,84202220,1070625363840,36012988082548233,

%T 2867622077261705078784,494207026605606690167323392,

%U 171330275896315127362166522313600

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

%H R. H. Hardin, <a href="/A172724/b172724.txt">Table of n, a(n) for n=1..21</a>

%K nonn

%O 1,3

%A _R. H. Hardin_ Feb 06 2010