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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 28 2013
STATUS
approved

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Last modified April 20 07:43 EDT 2024. Contains 371799 sequences. (Running on oeis4.)