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%I #5 Mar 31 2012 12:37:30
%S 123480,6933120,420545824,27425792944,1809791149768,121396901813560,
%T 8142073013529816,548770608436244800,36942499122761432872,
%U 2491439485029085248096,167889440702169327824712
%N 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having distinct edge sums
%C Column 6 of A209736
%H R. H. Hardin, <a href="/A209734/b209734.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..3..1..3..1..0..3..3....3..0..1..1..2..2..3....1..1..1..0..1..1..3
%e ..3..2..3..2..2..2..0....2..2..2..3..3..0..3....2..3..2..0..3..2..3
%e ..3..0..3..1..0..1..0....3..0..1..1..2..2..2....1..3..1..0..1..0..1
%e ..2..0..2..1..3..1..3....2..0..2..3..3..0..1....0..2..1..3..3..3..1
%e ..2..3..3..1..0..0..0....1..0..1..1..2..2..2....0..3..1..2..1..2..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 12 2012