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A217267 Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor. 0
0, 9, 1472, 2572816, 48909857500, 10211121295308649, 23397344246732649325860 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A217273

LINKS

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

EXAMPLE

Some solutions for n=3

..1..1..2....2..1..1....0..0..1....2..1..1....0..2..1....0..1..2....1..1..0

..1..0..2....2..1..0....3..1..2....1..0..1....1..0..1....1..1..3....1..0..0

..1..1..0....0..2..0....2..0..0....1..2..0....1..1..2....0..0..1....1..3..2

CROSSREFS

Sequence in context: A120347 A230172 A231191 * A300594 A203649 A187131

Adjacent sequences:  A217264 A217265 A217266 * A217268 A217269 A217270

KEYWORD

nonn,hard,more

AUTHOR

R. H. Hardin, Sep 29 2012

STATUS

approved

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Last modified May 9 13:42 EDT 2021. Contains 343742 sequences. (Running on oeis4.)