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%I #8 Oct 01 2021 17:34:52
%S 6,8,260,5826,66670,1168252,31032592,668814194,12704325536,
%T 268426296628,6190148621390,138489274808162,3029996476900546,
%U 68316028731518380,1579464310919005876,36414866362521221012,837970629282115803146
%N Number of 4 X n arrays containing n copies of 0..4-1 with no element 1 greater than its west, southwest or northwest neighbor modulo 4 and the upper left element equal to 0.
%C Row 4 of A267163.
%H R. H. Hardin, <a href="/A267165/b267165.txt">Table of n, a(n) for n = 1..18</a>
%e Some solutions for n=4
%e ..0..0..2..1....0..3..3..1....0..0..3..1....0..2..1..0....0..3..1..1
%e ..2..0..3..2....1..0..2..2....2..0..2..1....3..2..1..0....0..3..1..1
%e ..1..0..3..1....1..3..2..1....1..0..3..2....3..3..2..1....3..2..2..0
%e ..2..1..3..3....0..3..2..0....2..1..3..3....1..3..2..0....3..2..0..2
%Y Cf. A267163.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 11 2016
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