%I #6 Apr 26 2021 21:35:58
%S 6,136,2952,62336,1309863,27663713,590514107,12759661261,278866376604,
%T 6155545744454,137016855340060,3071168910680644,69236193887795927,
%U 1568315505284861894,35666332338351971086,813825644002258220522
%N Number of n X 4 0..2 arrays with exactly floor(n X 4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.
%C Column 4 of A222918.
%H R. H. Hardin, <a href="/A222915/b222915.txt">Table of n, a(n) for n = 1..55</a>
%e Some solutions for n=3
%e ..0..1..0..1....0..1..1..2....0..1..0..2....0..1..0..0....0..0..1..0
%e ..2..1..1..2....2..2..2..1....0..0..1..0....2..1..1..1....0..0..2..1
%e ..0..2..0..2....0..1..0..2....1..2..0..1....0..2..0..2....1..1..0..2
%Y Cf. A222918.
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 09 2013