A206940 Number of 7Xn 0..1 arrays avoiding 0 0 0 horizontally and 0 1 1 vertically.

54, 2916, 28081, 783557, 20054092, 348614952, 8138711727, 180107729045, 3670799062946, 80941950903896, 1744792238104043, 37022171557304461, 801688023085812936, 17220005386273509432, 368962831518287162081

Offset: 1

Author

R. H. Hardin Feb 13 2012

Keywords

• nonn

Comments

Row 7 of A206936

Examples

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

Links

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