%I #5 Mar 31 2012 12:36:57

%S 0,16,144,3364,30976,614656,8479744,129504400,1978826256,29961532836,

%T 454089995044,6895434839056,104626058201344,1587468792674704,

%U 24091008317030656,365573436678862864,5547427717263648804

%N Number of nX4 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1

%C Column 4 of A203542

%H R. H. Hardin, <a href="/A203538/b203538.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e ..0..0..0..1....2..0..0..1....1..0..0..1....2..1..0..2....2..1..0..1

%e ..1..1..0..1....1..1..0..1....1..0..2..1....0..1..0..1....0..1..0..1

%e ..0..0..2..2....0..1..2..1....1..2..0..0....0..2..1..1....0..0..2..2

%e ..0..0..1..0....0..0..2..0....0..2..1..0....1..0..1..0....1..0..1..0

%e ..1..1..1..0....1..1..1..0....0..1..1..0....1..0..1..0....1..0..1..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 02 2012