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%I #6 Aug 12 2016 06:54:16
%S 1,8,118,2386,54956,1350674,34568612,910791802,24537293344,
%T 672857207788,18718820026952,527018609703106,14988164468962816,
%U 429939684328203092,12424959589420164728,361409602487910188762,10572662501852062471576
%N Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north neighbor modulo 4 and the upper left element equal to 0.
%C Row 4 of A267751.
%H R. H. Hardin, <a href="/A267752/b267752.txt">Table of n, a(n) for n = 1..40</a>
%e Some solutions for n=4
%e ..0..0..3..2....0..3..3..1....0..3..1..3....0..2..0..2....0..1..1..3
%e ..1..1..3..2....1..0..0..2....1..3..2..0....1..2..0..3....0..2..1..3
%e ..2..1..0..2....2..0..1..3....2..0..2..0....1..3..1..3....0..2..2..3
%e ..3..1..0..3....2..1..2..3....3..1..2..1....1..0..2..3....1..2..3..0
%Y Cf. A267751.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 20 2016