A221603 Number of n X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns

0, 2, 54, 12270, 19521328, 240257613761, 22596355738886108

Offset

1,2

Comments

Diagonal of A221609

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A283678 A306266 A117681 * A359183 A089180 A034013

Adjacent sequences: A221600 A221601 A221602 * A221604 A221605 A221606

Keyword

nonn

Author

R. H. Hardin Jan 20 2013

Status

approved