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%I #6 Apr 26 2015 18:44:18
%S 1,25288120,8590448906009178865,2089345627982707177699421140008960,
%T 77513216887442246128882408582036570535556173496000,
%U 168135704190434138519823546360671865844450109820045620452225487496000
%N Number of 7*n X n 0..3 arrays with row sums 3 and column sums 21.
%H R. H. Hardin, <a href="/A172795/b172795.txt">Table of n, a(n) for n=1..10</a>
%K nonn
%O 1,2
%A _R. H. Hardin_, Feb 06 2010
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