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A221133
Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2
0
0, 9, 656, 643204, 4235650596, 259039174953636
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A221139
LINKS
Table of n, a(n) for n=1..6.
EXAMPLE
Some solutions for n=3
..2..1..0....2..2..1....0..2..1....0..1..2....2..2..1....0..0..1....2..1..0
..1..2..1....2..0..1....2..1..0....1..0..2....1..0..2....1..1..2....2..2..1
..0..2..0....0..0..1....2..1..0....2..1..0....0..0..1....2..2..0....0..1..0
CROSSREFS
Sequence in context: A081232 A020548 A091062 * A015007 A054327 A209964
Adjacent sequences: A221130 A221131 A221132 * A221134 A221135 A221136
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 02 2013
STATUS
approved

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Last modified September 28 21:16 EDT 2024. Contains 376297 sequences.
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