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

Offset

1,2

Comments

Column 2 of A199230

Links

R. H. Hardin, Table of n, a(n) for n = 1..153

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

Sequence in context: A013227 A013223 A219289 * A013224 A013230 A306342

Adjacent sequences: A199221 A199222 A199223 * A199225 A199226 A199227

Keyword

nonn

Author

R. H. Hardin Nov 04 2011

Status

approved