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A221120
Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor
0
1, 21, 4872, 16436223, 723234356389, 429398881440049645
OFFSET
1,2
COMMENTS
Diagonal of A221125
EXAMPLE
Some solutions for n=3
..1..0..1....1..1..3....2..0..0....1..1..0....0..3..0....1..0..3....2..0..1
..0..2..1....0..1..0....1..4..0....1..1..3....1..0..2....0..2..1....0..4..0
..3..0..1....1..1..1....0..0..2....1..1..0....0..1..2....0..2..0....0..0..2
CROSSREFS
Sequence in context: A209473 A055416 A220620 * A203370 A232344 A074053
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 02 2013
STATUS
approved