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 A199259 Number of 2n X 3 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to exactly one horizontal or vertical neighbor. 1

%I

%S 3,18,114,713,4508,28652,183442,1182513,7674706,50149664,329879020,

%T 2183961009,14549033194,97499792198,657083735088,4451886557217,

%U 30312912452386,207359582690700,1424583104395390,9826011131492859

%N Number of 2n X 3 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to exactly one horizontal or vertical neighbor.

%C 2n elements of column 3 of A199261.

%H R. H. Hardin, <a href="/A199259/b199259.txt">Table of n, a(n) for n = 1..71</a>

%e Some solutions for n=4

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

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

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

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

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

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

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

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

%Y Cf. A199261.

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 04 2011

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Last modified July 6 15:57 EDT 2022. Contains 355111 sequences. (Running on oeis4.)