A208870 Number of nX6 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.

187, 334618, 683903931, 1404920207834, 2887736845657700, 5935974611645510227, 12201956787655438957014, 25082292111547260024518313, 51559059416667161930347967813, 105984596999356698511898369562313

Offset: 1

Author

R. H. Hardin Mar 02 2012

Keywords

• nonn

Comments

Column 6 of A208872

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210