A199128 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 no element equal to any horizontal or vertical neighbor.

1, 2, 6, 19, 70, 264, 1038, 4155, 16896, 69584, 289146, 1211873, 5111178, 21686612, 92453594, 395888507, 1701506820, 7337867736, 31739124866, 137656095241, 598476364166, 2607710997676, 11385288787534, 49800060551081

Offset: 1

Author

R. H. Hardin Nov 03 2011

Keywords

• nonn

Comments

Column 3 of A199133

Examples

			Some solutions for n=5
..0..1..0....0..1..2....0..1..0....0..1..2....0..1..0....0..1..2....0..1..0
..1..0..2....2..0..1....1..0..2....1..0..1....1..0..2....1..2..0....2..0..2
..0..2..1....0..1..2....0..2..1....0..2..0....2..1..0....2..0..1....0..1..0
..2..0..2....1..2..0....2..1..2....2..1..2....1..2..1....1..2..0....1..2..1
..1..2..1....2..0..1....0..2..1....0..2..1....2..0..2....0..1..2....2..1..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..130