A208093 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

2, 30, 1573, 192328, 43366459, 15769674462, 8494585220016, 6391850672195207, 6435536606760976374, 8388789053759733374255, 13792349692923790472807338, 28002764873470436036725295426, 68986219453948522377865096287773

Offset: 1

Author

R. H. Hardin Feb 23 2012

Keywords

• nonn

Comments

Column 3 of A208096

Examples

			Some solutions for n=4
..0..1..2....0..1..0....0..1..0....0..1..2....0..1..0....0..1..0....0..1..0
..0..1..2....2..1..0....0..1..0....0..3..0....0..1..0....2..3..0....0..1..0
..0..1..0....3..1..2....0..1..0....0..1..0....2..1..2....0..3..0....0..1..2
..0..1..0....2..1..0....0..2..3....0..3..0....0..1..0....0..1..0....0..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..16