A206993 Number of nX7 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically.

81, 6561, 80070, 2371090, 60684900, 1482397764, 37849652838, 954576893140, 24031904480250, 606711286710758, 15303296459686032, 385968153194641688, 9736392679516458222, 245594233526815556440, 6194918451958959626262

Offset: 1

Author

R. H. Hardin Feb 14 2012

Keywords

• nonn

Comments

Column 7 of A206994

Examples

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

Links

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