%I #5 Mar 08 2013 18:52:16
%S 1,0,0,6,16,16,40,280,768,1440,3808,16352,45056,111104,300672,1072512,
%T 2959360,8281600,22668800,74866176,206880768,614068224,1691502592,
%U 5409544192,14973206528,45696688128,126360084480,398896128000
%N Number of nX1 0..2 arrays with exactly floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order
%C Column 1 of A222889
%H R. H. Hardin, <a href="/A222884/b222884.txt">Table of n, a(n) for n = 1..210</a>
%e All.solutions.for.n=4..
%e ..0....0....0....0....0....0
%e ..0....1....0....1....1....1
%e ..1....1....1....0....2....1
%e ..2....0....0....0....2....2
%K nonn
%O 1,4
%A _R. H. Hardin_ Mar 08 2013