A221750 Number of n X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns

0, 2, 0, 241, 4848, 6168942, 4330440582, 38847950279710

Offset

1,2

Comments

Diagonal of A221755

Links

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

Example

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

Crossrefs

Sequence in context: A111814 A036938 A344463 * A284451 A348183 A012330

Adjacent sequences: A221747 A221748 A221749 * A221751 A221752 A221753

Keyword

nonn

Author

R. H. Hardin Jan 24 2013

Status

approved