A221387 Number of nX7 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, 918, 284702, 86673898, 25415184702, 7392392443622, 2142967506078650, 620488065801083664, 179590766393598824048

Offset

1,2

Comments

Column 7 of A221388

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A234764 A282592 A029897 * A217226 A217344 A221113

Adjacent sequences: A221384 A221385 A221386 * A221388 A221389 A221390

Keyword

nonn

Author

R. H. Hardin Jan 14 2013

Status

approved