A207181 Number of nX7 0..1 arrays avoiding 0 0 0 horizontally and 0 1 0 vertically.

81, 6561, 248525, 9196215, 368714705, 14960137403, 600838995529, 24069606968809, 965286091829121, 38732271412245771, 1553999307045885583, 62342694966576014475, 2501032004180975268881, 100336844251838872157471

Offset: 1

Author

R. H. Hardin Feb 15 2012

Keywords

• nonn

Comments

Column 7 of A207182

Examples

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

Links

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