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A240627 Number of nX4 0..3 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..3 introduced in row major order.

%I A240627 #6 Jul 23 2025 11:02:55
%S A240627 12,1332,180480,24648700,3367163455,459961775083,62832360051504,
%T A240627 8583108386132548,1172481146489555199,160164822767286567296,
%U A240627 21879047288760831684789,2988750601081901561336772
%N A240627 Number of nX4 0..3 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..3 introduced in row major order.
%C A240627 Column 4 of A240629
%H A240627 R. H. Hardin, <a href="/A240627/b240627.txt">Table of n, a(n) for n = 1..178</a>
%e A240627 Some solutions for n=3
%e A240627 ..0..1..0..2....0..0..0..1....0..1..0..1....0..0..1..2....0..1..0..1
%e A240627 ..0..3..1..3....1..0..2..3....2..1..3..3....3..2..2..1....2..3..0..3
%e A240627 ..3..0..2..3....0..1..1..2....3..3..1..1....2..3..0..3....2..0..1..2
%K A240627 nonn
%O A240627 1,1
%A A240627 _R. H. Hardin_, Apr 09 2014