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%I #6 Aug 12 2016 06:53:59
%S 1,1,2,5,18,64,200,608,1892,6003,19569,64801,214944,712344,2360429,
%T 7831744,26066842,87077489,291778301,979938877,3296756218,11106812985,
%U 37470837895,126595907915,428321817846,1451164032530,4922769173389
%N Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northwest neighbor modulo 3 and the upper left element equal to 0.
%C Row 3 of A266832.
%H R. H. Hardin, <a href="/A266833/b266833.txt">Table of n, a(n) for n = 1..94</a>
%e Some solutions for n=5
%e ..0..0..2..2..1....0..0..2..1..0....0..0..2..1..1....0..2..1..1..1
%e ..0..2..2..1..1....2..2..2..1..0....0..2..2..1..1....0..2..1..0..0
%e ..0..2..1..1..0....2..1..1..1..0....0..2..2..1..0....2..2..1..0..2
%Y Cf. A266832.
%K nonn
%O 1,3
%A _R. H. Hardin_, Jan 04 2016
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