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A221872 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction 0
1, 1442, 109441, 14388224, 1572414124, 180850094177, 20435867743591, 2319666884003899, 262884477993316833 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221873

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3

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

..1..1..0..1....0..3..0..3....2..3..1..1....0..3..1..1....0..4..3..0

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

CROSSREFS

Sequence in context: A178275 A220651 A252224 * A251842 A105417 A105416

Adjacent sequences:  A221869 A221870 A221871 * A221873 A221874 A221875

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 2013

STATUS

approved

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Last modified April 3 12:37 EDT 2020. Contains 333197 sequences. (Running on oeis4.)