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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
OFFSET
1,2
COMMENTS
Diagonal of A217273
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
KEYWORD
nonn,hard,more
AUTHOR
R. H. Hardin, Sep 29 2012
STATUS
approved