A208263 Number of n X n 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.

1, 7, 161, 11929, 2867739, 2234126207, 5641457245533, 46171961042899417, 1224814800337927770335, 105309458529148583423889079, 29347371781481633173790977728301, 26507936613513086328494176843991041391

Offset: 1

Author

R. H. Hardin Feb 24 2012

Keywords

• nonn

Comments

Diagonal of A208269

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..19