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%I #6 Aug 12 2016 06:53:59
%S 6,234,14540,1044230,81918724,6799306012,587026055968,52178873655200,
%T 4743093016860180,438882927135198876,41201333430973995312,
%U 3914496456510827388928,375684251811756396598000
%N Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northeast neighbor modulo 4 and the upper left element equal to 0.
%C Row 4 of A266655.
%H R. H. Hardin, <a href="/A266657/b266657.txt">Table of n, a(n) for n = 1..34</a>
%e Some solutions for n=3
%e ..0..2..3....0..3..3....0..3..2....0..1..3....0..2..3....0..1..3....0..3..3
%e ..0..3..0....2..2..0....1..2..1....1..3..3....0..3..3....3..1..0....1..1..0
%e ..1..3..2....0..3..1....2..0..3....1..2..2....1..2..1....0..2..3....1..0..2
%e ..1..1..2....2..1..1....3..1..0....2..0..0....0..1..2....2..1..2....2..2..3
%Y Cf. A266655.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 02 2016