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A221322 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2 0
1, 17, 2008, 2460824, 26135748494, 2568131772343102, 2242286238164144345340, 17596650117587793920907469032 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A221328
LINKS
EXAMPLE
Some solutions for n=3
..1..1..2....2..0..1....0..2..0....1..0..2....0..2..1....1..0..1....2..1..0
..0..0..1....1..2..1....1..2..1....1..1..0....2..0..0....1..2..1....2..1..1
..1..1..2....0..2..0....0..1..2....2..1..1....1..2..1....1..2..0....1..1..0
CROSSREFS
Sequence in context: A276808 A088465 A001905 * A135505 A171704 A198288
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 11 2013
STATUS
approved

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Last modified February 25 12:20 EST 2024. Contains 370325 sequences. (Running on oeis4.)