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%I #9 Sep 03 2022 20:32:38
%S 11,2768,269496,30132444,3228500154,353403366772,38323943289566,
%T 4170998760222200,453352604882802786,49299729427562107330,
%U 5360092608575438753444,582815441403601709584574
%N 1/3 the number of n X 6 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
%C Column 6 of A185559.
%H R. H. Hardin, <a href="/A185556/b185556.txt">Table of n, a(n) for n = 1..27</a>
%e Some solutions for 4 X 6 with a(1,1)=0
%e ..0..0..1..0..0..2....0..0..2..2..1..1....0..0..0..2..1..1....0..0..0..0..2..2
%e ..0..1..1..2..0..2....0..1..1..1..2..2....0..1..1..2..2..1....0..1..1..1..0..0
%e ..0..0..2..2..0..1....0..0..0..1..2..2....0..0..1..1..2..1....0..0..2..0..2..2
%e ..1..1..1..1..0..1....1..1..1..0..0..0....1..1..0..0..2..2....1..1..2..0..0..2
%Y Cf. A185559.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 31 2011