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%I #6 Aug 12 2016 06:53:59
%S 2,6,44,438,4156,49033,588632,8351513,113609298,1770032098,
%T 26096782411,426735882363,6595598937191,110427559297288,
%U 1759795259815468,29843750451187538,485812231474336419,8302508424244712407
%N Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west, northeast or southeast neighbor modulo 4 and the upper left element equal to 0.
%C Row 4 of A266854.
%H R. H. Hardin, <a href="/A266855/b266855.txt">Table of n, a(n) for n = 1..22</a>
%e Some solutions for n=5
%e ..0..2..1..1..3....0..3..2..0..2....0..2..1..0..3....0..2..1..3..1
%e ..2..0..3..3..1....2..1..0..0..2....2..0..3..3..1....2..0..3..1..3
%e ..0..3..2..1..1....0..3..3..2..1....0..3..2..1..1....0..2..1..3..2
%e ..2..2..0..0..3....3..1..1..1..3....2..2..1..0..3....0..0..3..2..1
%Y Cf. A266854.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 04 2016
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