A185558 1/3 the number of nX8 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

43, 63544, 29168100, 15594228288, 7976049592892, 4170998760222200, 2159859526859795892

Offset

1,1

Comments

Column 8 of A185559

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 4X8 with a(1,1)=0
..0..0..0..1..2..2..2..2....0..0..0..1..0..2..2..2....0..0..0..1..1..0..0..0
..0..1..0..1..2..0..0..2....0..1..0..1..0..0..1..1....0..1..0..1..2..2..2..0
..0..1..0..1..0..1..2..2....0..1..0..1..2..2..2..1....0..1..0..1..0..0..1..1
..0..0..0..1..0..1..0..0....0..0..0..1..1..1..2..1....0..0..0..1..1..2..2..1

Crossrefs

Sequence in context: A302484 A177488 A262648 * A155477 A212738 A291993

Adjacent sequences: A185555 A185556 A185557 * A185559 A185560 A185561

Keyword

nonn

Author

R. H. Hardin Jan 31 2011

Status

approved