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A199090 Number of 2nX4 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 exactly one horizontal or vertical neighbor 0

%I

%S 5,420,44837,5471810,726413391,101787127746,14800090575471,

%T 2211229549716802,337343474770282699,52327061345761775192

%N Number of 2nX4 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 exactly one horizontal or vertical neighbor

%C Even terms of column 4 of A199092

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 02 2011

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Last modified August 16 14:26 EDT 2022. Contains 356168 sequences. (Running on oeis4.)