A221851 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction

13, 3437, 465305, 67228149, 9607602488, 1374453486067, 196583533871825, 28117377558933453

Offset

1,1

Comments

Column 4 of A221852

Links

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

Example

Some solutions for n=3
..0..2..1..0....0..2..0..0....0..1..1..0....0..3..0..2....0..4..0..2
..0..0..3..0....0..1..7..0....1..0..1..4....0..1..0..2....0..0..1..0
..1..3..2..0....1..0..1..0....0..3..0..1....0..1..1..2....0..3..1..1

Crossrefs

Sequence in context: A159357 A221885 A134159 * A221924 A292109 A337147

Adjacent sequences: A221848 A221849 A221850 * A221852 A221853 A221854

Keyword

nonn

Author

R. H. Hardin Jan 27 2013

Status

approved