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%I #5 Mar 31 2012 12:35:53
%S 7776,446976,25713200,1498220176,87799260864,5165337368432,
%T 304621701959456,17993221408945104,1063903982909017728,
%U 62948883215402279728,3726195792332543835152,220632798983713149344688
%N 1/120 the number of (n+1)X7 0..4 arrays with every 2X2 subblock containing four distinct values
%C Column 6 of A183622
%H R. H. Hardin, <a href="/A183619/b183619.txt">Table of n, a(n) for n = 1..28</a>
%e Some solutions with the first square being 0123 for 3X7
%e ..0..1..0..3..0..1..0....0..1..0..2..3..2..3....0..1..0..1..4..1..4
%e ..2..3..2..1..2..3..2....2..3..4..1..4..1..4....2..3..4..2..3..2..0
%e ..0..4..0..4..0..4..0....4..1..0..2..0..3..2....4..1..0..1..4..1..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 06 2011
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