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A222884 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 5

%I

%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

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Last modified May 25 22:51 EDT 2022. Contains 354073 sequences. (Running on oeis4.)