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%I #6 Aug 12 2016 06:53:59
%S 2,11,91,829,8013,80497,830673,8743293,93437237,1010633645,
%T 11038556349,121547316675,1347523434675,15026262949575,
%U 168400839231879,1895558909938005,21419116890326757,242855221965797157
%N Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northeast neighbor modulo 3 and the upper left element equal to 0.
%C Row 3 of A266655.
%H R. H. Hardin, <a href="/A266656/b266656.txt">Table of n, a(n) for n = 1..87</a>
%e Some solutions for n=4
%e ..0..1..1..2....0..2..2..0....0..2..1..1....0..1..2..1....0..0..0..2
%e ..0..0..1..2....2..2..0..1....2..1..0..0....0..2..0..1....2..2..2..1
%e ..2..1..2..0....1..0..1..1....1..2..0..2....2..2..0..1....1..1..1..0
%Y Cf. A266655.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 02 2016
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