login
Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order
1

%I #4 Feb 19 2013 03:27:18

%S 3,13,75,766,7929,88455,1009168,11742060,136046418,1597242853,

%T 18702751927,220911842244,2604575617765,30883966174713,

%U 365980036374753,4353382994459175,51789654728027158,617680862903883768

%N Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order

%C Column 4 of A222430

%H R. H. Hardin, <a href="/A222427/b222427.txt">Table of n, a(n) for n = 1..78</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 19 2013