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%I #8 Jun 07 2021 15:00:48
%S 2,0,1,15,65,202,537,1559,6506,27557,104122,360598,1236670,4479897,
%T 16998081,64623235,240399786,880495525,3233751496,12035510317,
%U 45240963675,170207777737,637838570111,2384646622991,8931032553574
%N Number of 3 X n arrays containing n copies of 0..3-1 with no element 1 greater than its west, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
%C Row 3 of A267163.
%H R. H. Hardin, <a href="/A267164/b267164.txt">Table of n, a(n) for n = 1..89</a>
%e Some solutions for n=4
%e ..0..2..1..1....0..2..1..0....0..0..2..2....0..0..2..1....0..2..2..1
%e ..0..2..2..1....2..2..1..0....1..0..2..1....0..2..2..1....0..0..2..1
%e ..0..0..2..1....2..1..1..0....1..0..2..1....0..2..1..1....1..0..2..1
%Y Cf. A267163.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 11 2016
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