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A198181 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.

%I A198181 #7 Jun 02 2025 05:23:57
%S A198181 2,8,25,59,331,883,3485,12030,43774,155664,540628,1936313,6871687,
%T A198181 24471790,86551688,306708029,1089956129,3870392120,13733968845,
%U A198181 48703981505,172844148554,613561265167,2177517194687,7726401450405
%N A198181 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.
%C A198181 Every 0 is next to 0 0's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 0's
%C A198181 Column 4 of A198185
%H A198181 R. H. Hardin, <a href="/A198181/b198181.txt">Table of n, a(n) for n = 1..210</a>
%e A198181 Some solutions containing all values 0 to 4 for n=5
%e A198181 ..0..1..2..1....1..2..1..0....1..2..1..0....0..1..1..2....1..0..1..2
%e A198181 ..3..0..3..0....0..3..0..3....0..3..0..3....1..2..0..1....2..3..0..1
%e A198181 ..0..4..0..1....3..0..4..0....1..0..4..0....1..0..4..0....1..0..4..0
%e A198181 ..3..0..3..2....0..3..0..3....2..3..0..1....2..3..0..1....0..3..0..3
%e A198181 ..0..3..0..1....1..2..1..0....1..0..1..2....1..0..1..2....1..2..1..0
%K A198181 nonn
%O A198181 1,1
%A A198181 _R. H. Hardin_ Oct 21 2011