A221272 Number of nX4 arrays of occupancy after each element moves to some king-move neighbor, with every occupancy equal to zero or two

1, 52, 596, 7252, 94659, 1250015, 16474842, 217194702, 2863102280, 37731750319, 497133557199, 6548899949298, 86261110576994, 1136131886838454

Offset

1,2

Comments

Column 4 of A221273

Links

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

Example

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

Crossrefs

Sequence in context: A294055 A285753 A100413 * A254137 A249712 A255945

Adjacent sequences: A221269 A221270 A221271 * A221273 A221274 A221275

Keyword

nonn

Author

R. H. Hardin Jan 08 2013

Status

approved