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A199518 Number of nX3 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors 1

%I

%S 1,45,1260,15400,2513869,174524175,5866391058,78538951349,

%T 14918883751196,1134907763429651,40321453946092356,558398606969183196,

%U 113331120839472129952,8998123036816556850222,328615244611727182223731

%N Number of nX3 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors

%C Column 3 of A199523

%H R. H. Hardin, <a href="/A199518/b199518.txt">Table of n, a(n) for n = 1..21</a>

%e Some solutions for n=3

%e ..0..0..1....0..0..1....0..1..1....0..1..1....0..1..0....0..1..0....0..1..2

%e ..2..2..3....2..1..2....2..3..0....2..3..3....1..2..3....2..1..2....3..0..3

%e ..2..1..3....3..0..3....3..2..2....2..0..2....2..0..3....3..3..2....1..2..2

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 07 2011

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Last modified January 24 08:31 EST 2022. Contains 350534 sequences. (Running on oeis4.)