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Number of nX4 0..2 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..2 introduced in row major order
1

%I #4 Apr 16 2014 11:12:11

%S 2,17,152,1670,19619,238607,2939027,36470565,454209512,5665536042,

%T 70725144550,883230404813,11031990457193,137807268659287,

%U 1721508492588267,21505781617159089,268661629731046770

%N Number of nX4 0..2 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..2 introduced in row major order

%C Column 4 of A241138

%H R. H. Hardin, <a href="/A241135/b241135.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Apr 16 2014