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%I #6 Aug 12 2016 06:53:59
%S 1,1,2,5,11,26,46,121,400,1109,2924,7992,21954,61748,176647,499953,
%T 1409763,3999662,11391787,32574599,93459472,268336008,771070141,
%U 2219952038,6403510479,18502345738,53538515560,155090741042,449731074132
%N Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
%C Row 3 of A266878.
%H R. H. Hardin, <a href="/A266879/b266879.txt">Table of n, a(n) for n = 1..104</a>
%e All solutions for n=4
%e ..0..2..2..1....0..2..1..0....0..0..2..1....0..2..1..1....0..1..2..0
%e ..0..2..1..1....2..2..1..0....0..2..2..1....0..2..1..0....2..0..1..2
%e ..0..2..1..0....2..1..1..0....0..2..1..1....2..2..1..0....1..2..0..1
%Y Cf. A266878.
%K nonn
%O 1,3
%A _R. H. Hardin_, Jan 05 2016
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