A185834 Half the number of nX8 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

13, 1103, 17877, 257050, 4143707, 68363184, 1073661088, 17200095426, 278159538826, 4418356392225, 71020967453692, 1136704302337236, 18204389915482609, 291581361291318489, 4670236803825684178

Offset: 1

Author

R. H. Hardin Feb 05 2011

Keywords

• nonn

Comments

Column 8 of A185835

Examples

			Some solutions for 4X8 with a(1,1)=0
..0..0..0..1..1..0..0..0....0..0..0..0..0..0..1..1....0..1..1..0..1..0..1..1
..0..1..1..0..0..1..1..1....0..1..1..1..1..1..0..0....0..1..0..0..1..0..0..1
..0..0..0..1..0..1..0..0....0..1..0..0..0..0..1..1....0..1..1..1..0..1..1..1
..1..1..1..1..0..0..1..1....0..0..1..1..1..0..0..1....0..0..0..0..0..1..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..101