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A221258 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2 1
0, 64, 112, 58081, 1319409, 103489929, 4085800416, 226720727104, 10445351809532, 530909339760900, 25591483232781872, 1268920553028932644, 61970903049203536750, 3051063081822723807844, 149565983362653741790314 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221255

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A094682 A118158 A264590 * A195678 A029777 A145464

Adjacent sequences:  A221255 A221256 A221257 * A221259 A221260 A221261

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2013

STATUS

approved

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Last modified October 20 19:28 EDT 2020. Contains 337909 sequences. (Running on oeis4.)