A221383 Number of n X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2

0, 0, 4, 1198, 1829388, 23796035743, 2142967506078650, 1608943108575146892075

Offset

1,3

Comments

Diagonal of A221388

Links

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

Example

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

Crossrefs

Sequence in context: A248656 A357512 A309979 * A338104 A198899 A350341

Adjacent sequences: A221380 A221381 A221382 * A221384 A221385 A221386

Keyword

nonn

Author

R. H. Hardin Jan 14 2013

Status

approved