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A267023 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any northeast or northwest neighbors modulo 4 and the upper left element equal to 0.

%I A267023 #6 Aug 12 2016 06:54:00
%S A267023 6,8,21,137,759,4835,31591,216460,1516047,10864196,79437844,590119523,
%T A267023 4453596825,34028591249,263304258843,2058154419091,16252842542358,
%U A267023 129434331448080,1039407597863960,8405943746368118,68447035142972923
%N A267023 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any northeast or northwest neighbors modulo 4 and the upper left element equal to 0.
%C A267023 Row 4 of A267019.
%H A267023 R. H. Hardin, <a href="/A267023/b267023.txt">Table of n, a(n) for n = 1..23</a>
%e A267023 Some solutions for n=4
%e A267023 ..0..1..3..1....0..2..0..2....0..2..0..2....0..2..0..2....0..1..3..1
%e A267023 ..2..0..2..0....3..1..3..1....2..0..3..1....3..1..3..1....2..0..2..0
%e A267023 ..1..3..1..3....1..0..2..3....1..3..1..3....1..3..1..3....0..2..1..3
%e A267023 ..0..2..3..2....1..2..0..3....0..1..3..2....0..2..0..2....3..1..3..2
%Y A267023 Cf. A267019.
%K A267023 nonn
%O A267023 1,1
%A A267023 _R. H. Hardin_, Jan 09 2016