A217226 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no 2-loops and with no occupancy greater than 2.

0, 918, 311988, 102825095, 31887740915, 9769688294715, 2974880888318062, 903639757522112579

Offset

1,2

Comments

Column 6 of A217227

Links

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

Example

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

Crossrefs

Sequence in context: A395432 A029897 A221387 * A217344 A221113 A062335

Adjacent sequences: A217223 A217224 A217225 * A217227 A217228 A217229

Keyword

nonn

Author

R. H. Hardin, Jan 07 2013

Status

approved