%I #5 Mar 31 2012 12:36:57
%S 1,22,543,8837,143936,2527020,44974778,799146435,14222292590,
%T 253497958735,4520112095307,80604855648245,1437506215952323,
%U 25637856292628890,457259186435170066,8155419408921364692
%N Number of nX4 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
%C Column 4 of A203460
%H R. H. Hardin, <a href="/A203456/b203456.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=5
%e ..1..1..0..0....2..2..1..1....1..2..2..2....1..1..1..1....0..1..2..2
%e ..1..2..2..1....2..2..1..1....1..2..0..2....1..2..2..2....1..1..2..2
%e ..1..2..2..1....1..0..0..0....2..2..0..2....1..2..2..2....1..2..2..1
%e ..2..2..1..0....2..2..0..0....2..1..2..2....2..2..1..1....0..2..2..0
%e ..2..2..0..0....2..2..0..0....2..2..2..1....2..2..1..1....0..1..1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 02 2012