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A183600 1/6 the number of (n+1)X7 0..2 arrays with every 2X2 subblock containing all three values.

%I A183600 #7 Jul 22 2025 09:08:00
%S A183600 10572,574185,27768032,1376627608,68026656422,3366668183708,
%T A183600 166653005250320,8251614370134644,408619818725184342,
%U A183600 20236484168674868650,1002238533164802053394,49638595435230968839084
%N A183600 1/6 the number of (n+1)X7 0..2 arrays with every 2X2 subblock containing all three values.
%C A183600 Column 6 of A183603
%H A183600 R. H. Hardin, <a href="/A183600/b183600.txt">Table of n, a(n) for n = 1..200</a>
%e A183600 Some solutions with a(1,1)=0 for 3X7
%e A183600 ..0..0..2..0..1..1..2....0..0..0..1..2..2..0....0..0..0..0..1..0..1
%e A183600 ..1..2..1..0..2..0..1....1..2..1..2..0..1..0....1..2..1..2..2..0..2
%e A183600 ..2..0..2..0..1..0..2....2..0..0..1..2..0..2....0..0..0..1..0..1..0
%K A183600 nonn
%O A183600 1,1
%A A183600 _R. H. Hardin_ Jan 05 2011