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

1,1

Comments

Column 8 of A185835

Links

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

Example

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

Crossrefs

Sequence in context: A282968 A262632 A076481 * A264249 A195890 A195520

Adjacent sequences: A185831 A185832 A185833 * A185835 A185836 A185837

Keyword

nonn

Author

R. H. Hardin Feb 05 2011

Status

approved