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A199519 Number of nX4 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 0

%I

%S 1,105,15400,2491383,425836476,76066541392,14045226977086,

%T 2659503142845964,513629992322483274,100788315834577397826,

%U 20037985877897676968942

%N Number of nX4 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 4 of A199523

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 07 2011

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Last modified May 20 13:00 EDT 2022. Contains 353873 sequences. (Running on oeis4.)