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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 October 21 04:00 EDT 2021. Contains 348141 sequences. (Running on oeis4.)