A185556 1/3 the number of n X 6 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

11, 2768, 269496, 30132444, 3228500154, 353403366772, 38323943289566, 4170998760222200, 453352604882802786, 49299729427562107330, 5360092608575438753444, 582815441403601709584574

Offset

1,1

Comments

Column 6 of A185559.

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

Some solutions for 4 X 6 with a(1,1)=0
..0..0..1..0..0..2....0..0..2..2..1..1....0..0..0..2..1..1....0..0..0..0..2..2
..0..1..1..2..0..2....0..1..1..1..2..2....0..1..1..2..2..1....0..1..1..1..0..0
..0..0..2..2..0..1....0..0..0..1..2..2....0..0..1..1..2..1....0..0..2..0..2..2
..1..1..1..1..0..1....1..1..1..0..0..0....1..1..0..0..2..2....1..1..2..0..0..2

Crossrefs

Cf. A185559.

Sequence in context: A239897 A138075 A222315 * A227785 A216347 A214137

Adjacent sequences: A185553 A185554 A185555 * A185557 A185558 A185559

Keyword

nonn

Author

R. H. Hardin, Jan 31 2011

Status

approved