A221407 Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two

8, 328, 12668, 492102, 18852560, 722442370, 27665242848, 1058237377670

Offset

1,1

Comments

Column 6 of A221408

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..0..0..2..0..2..2....0..0..2..2..0..2....2..2..0..2..0..2....2..0..0..0..2..0
..2..0..0..2..0..0....2..0..2..0..0..2....2..0..0..2..0..0....2..2..2..2..2..0
..2..0..2..2..0..2....0..2..2..0..0..2....0..2..2..0..2..0....0..0..2..0..0..2

Crossrefs

Sequence in context: A344094 A264053 A300613 * A204069 A226551 A285370

Adjacent sequences: A221404 A221405 A221406 * A221408 A221409 A221410

Keyword

nonn

Author

R. H. Hardin Jan 15 2013

Status

approved