A208863 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 left-upward diagonal neighbors.

715, 4313071, 28686344276, 192108983085145, 1287681340443915644, 8632160191264007914496, 57867813487534623493632032, 387931894337100662003223085624, 2600602689186684798782025006594196

Offset: 1

Author

R. H. Hardin Mar 02 2012

Keywords

• nonn

Comments

Column 7 of A208864

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..42