A221380 Number of nX6 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two

0, 16, 0, 1156, 0, 120409, 0, 13075456, 0, 1425817600, 0, 155542683321, 0, 16968863171584

Offset

1,2

Comments

Column 6 of A221381

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=4
..0..2..2..2..0..0....0..2..2..2..2..0....0..2..0..0..0..2....0..2..2..0..2..0
..0..0..2..2..2..0....0..2..0..0..0..2....2..2..2..2..2..0....0..2..0..2..2..0
..0..2..2..2..0..0....2..2..2..0..2..0....0..0..0..0..0..2....2..2..0..0..0..0
..0..0..2..2..2..0....0..0..0..2..2..0....2..2..2..0..2..0....0..2..2..2..2..0

Crossrefs

Sequence in context: A221271 A198804 A274377 * A221759 A111979 A309984

Adjacent sequences: A221377 A221378 A221379 * A221381 A221382 A221383

Keyword

nonn

Author

R. H. Hardin Jan 14 2013

Status

approved