A221550 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns

4, 503, 48018, 4107189, 354544219, 30591390580, 2639211238177, 227683834800188

Offset

1,1

Comments

Column 4 of A221551

Links

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

Example

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

Crossrefs

Sequence in context: A210310 A324155 A350968 * A022919 A253904 A268468

Adjacent sequences: A221547 A221548 A221549 * A221551 A221552 A221553

Keyword

nonn

Author

R. H. Hardin Jan 19 2013

Status

approved