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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A221255

LINKS

Table of n, a(n) for n=1..8.

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: A337969 A234566 A201974 * A119926 A103307 A196248

Adjacent sequences: A221247 A221248 A221249 * A221251 A221252 A221253

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2013

STATUS

approved

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Last modified February 6 10:18 EST 2023. Contains 360104 sequences. (Running on oeis4.)