A208200 Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.

715, 10215440, 153402542384, 2303673397508915, 34594950233928279876, 519522527116810577984260, 7801822458198433796561428608, 117162260457319989881048135168019, 1759460094015764611132758812387283596

Offset: 1

Author

R. H. Hardin Feb 24 2012

Keywords

• nonn

Comments

Column 7 of A208201

Examples

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

Links

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