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A221347 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2 0
1, 1001, 60807, 4413085, 308965149, 22068912649, 1581061669545, 113618510899217, 8171887820833287, 587983789007292695, 42310129466893396913, 3044554852614334562897 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221345

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A204965 A192776 A218640 * A109431 A267599 A140927

Adjacent sequences:  A221344 A221345 A221346 * A221348 A221349 A221350

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 11 2013

STATUS

approved

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Last modified June 30 18:41 EDT 2022. Contains 354945 sequences. (Running on oeis4.)