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A221603 Number of n X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns 0
0, 2, 54, 12270, 19521328, 240257613761, 22596355738886108 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A221609

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

..0..1..1....1..2..0....0..2..2....0..3..1....0..3..1....0..3..1....1..1..0

..1..3..0....1..1..0....0..2..0....1..1..0....0..1..1....1..0..0....1..3..0

..0..2..1....1..3..0....1..2..0....0..2..1....1..2..0....1..3..0....1..2..0

CROSSREFS

Sequence in context: A283678 A306266 A117681 * A089180 A280209 A034013

Adjacent sequences:  A221600 A221601 A221602 * A221604 A221605 A221606

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 20 2013

STATUS

approved

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Last modified February 24 01:16 EST 2020. Contains 332195 sequences. (Running on oeis4.)