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A221250
Number of n X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2
0
0, 4, 30, 58081, 78633756, 4919350997521, 720107530988047980, 2283974100099963226425600
OFFSET
1,2
COMMENTS
Diagonal of A221255
EXAMPLE
Some solutions for n=3
..0..2..0....1..2..0....0..2..0....1..2..0....0..2..1....1..2..1....0..2..1
..2..2..0....1..2..0....1..2..0....0..2..1....1..2..0....0..2..0....1..2..1
..1..2..0....1..2..0....2..2..0....1..2..0....1..2..0....0..2..1....0..2..0
CROSSREFS
Sequence in context: A234566 A365366 A201974 * A119926 A103307 A196248
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 06 2013
STATUS
approved