

A199224


Number of nX2 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 zero or one horizontal or vertical neighbors


1



1, 6, 15, 148, 739, 1538, 19458, 99290, 199245, 2737170, 14308328, 28263858, 406132996, 2157586976, 4223483322, 62496247170, 335699045124, 653268735784, 9869313704764, 53437060321924, 103559574448252, 1588892060781914
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OFFSET

1,2


COMMENTS



LINKS



EXAMPLE

Some solutions for n=4
..0..1....0..1....0..0....0..1....0..1....0..0....0..1....0..1....0..1....0..1
..1..2....0..1....1..2....0..1....2..0....1..1....2..0....0..2....2..0....2..2
..2..0....2..2....0..1....1..2....2..1....2..0....0..1....1..0....1..2....0..1
..1..0....1..0....2..2....0..2....0..1....2..1....2..1....1..2....0..2....2..1


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



