login
A199241
Number of nX3 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 two horizontal or vertical neighbors
1
1, 2, 6, 25, 110, 472, 2080, 9279, 41704, 187500, 853012, 3919309, 18163022, 84589504, 395762792, 1858908001, 8762833946, 41439737234, 196527899276, 934460643457, 4453641597888, 21271612632536, 101795771318046
OFFSET
1,2
COMMENTS
Column 3 of A199246
LINKS
EXAMPLE
Some solutions for n=4
..0..1..2....0..1..2....0..1..2....0..1..2....0..1..0....0..1..2....0..1..0
..1..2..0....2..0..1....1..2..0....2..0..1....1..0..1....1..2..0....2..0..1
..2..0..1....1..2..0....0..1..2....0..1..2....2..2..0....2..0..1....1..2..0
..0..1..2....2..0..1....2..0..1....2..0..1....2..2..1....1..2..0....2..1..2
CROSSREFS
Sequence in context: A074418 A330637 A003454 * A366236 A276277 A355862
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved