A208871 Number of nX7 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.

715, 4578580, 32271626438, 228847686794351, 1624001903270517563, 11525604443642285224422, 81798476241280856702695038, 580533377647449287012352167379, 4120113916814898485216382089787455

Offset: 1

Author

R. H. Hardin Mar 02 2012

Keywords

• nonn

Comments

Column 7 of A208872

Examples

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

Links

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