%I #5 Mar 31 2012 12:36:34
%S 76,3838,213328,12510524,757941274,46796529288,2920541321626,
%T 183371225099361,11551938856624945,729096061168837827,
%U 46063831233179842268,2911931787180884205541,184135675347690092435300
%N Number of 2nX6 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly one horizontal or vertical neighbor
%C Column 3 of A198532
%H R. H. Hardin, <a href="/A198530/b198530.txt">Table of n, a(n) for n = 1..131</a>
%e Some solutions for n=4
%e ..0..0..1..0..0..1....0..0..1..0..0..1....0..0..1..0..0..1....0..0..1..0..0..1
%e ..2..2..1..2..2..1....2..2..1..2..2..1....2..2..1..2..2..1....1..2..1..2..2..1
%e ..1..1..2..1..1..2....0..1..2..0..0..2....0..1..0..0..1..0....1..2..0..0..1..0
%e ..0..0..2..0..0..2....0..1..2..1..1..2....0..1..2..2..1..0....2..0..2..2..1..0
%e ..1..2..0..2..1..1....1..0..0..2..2..1....1..2..0..0..2..2....2..0..1..1..0..1
%e ..1..2..0..2..0..0....1..2..2..0..0..1....1..2..1..1..0..1....1..1..2..2..0..1
%e ..2..0..1..1..2..2....2..0..0..1..1..0....0..0..2..2..0..1....0..0..1..0..2..0
%e ..2..0..2..2..0..0....2..1..1..2..2..0....2..2..1..1..2..2....2..2..1..0..2..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 26 2011
