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%I #6 Aug 12 2016 06:54:00
%S 6,0,0,1,22,396,2516,10533,33704,92526,369726,2640466,20643782,
%T 138985920,774999596,3688265633,16042197634,71499663298,364035498690,
%U 2117882102632,12817951753070,74510126235424,404088344721210,2063669373837938
%N Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo 4 and the upper left element equal to 0.
%C Row 4 of A267328.
%H R. H. Hardin, <a href="/A267333/b267333.txt">Table of n, a(n) for n = 1..32</a>
%e Some solutions for n=6
%e ..0..1..2..2..3..3....0..1..2..3..0..0....0..1..2..2..3..0....0..0..0..1..2..3
%e ..0..1..1..2..3..0....0..1..2..3..3..0....1..1..2..3..3..0....3..0..1..1..2..3
%e ..0..1..2..2..3..0....1..1..2..2..3..0....0..1..2..3..3..0....3..0..1..1..2..2
%e ..1..1..2..3..3..0....1..1..2..2..3..3....1..1..2..2..3..0....3..0..1..2..2..3
%Y Cf. A267328.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 13 2016
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