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A221771 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out left turns 0
21, 2127, 225873, 23965217, 2541024755, 269350655878, 28548644230368, 3025789208683568, 320691065003362685, 33988597488799369041, 3602292346906129492849 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A221773
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..2....1..1..0..0....0..3..0..0....0..1..1..2....0..1..0..1
..1..1..0..1....1..1..2..2....1..3..0..1....1..2..1..0....0..2..1..2
..0..3..3..0....0..0..4..0....1..1..1..1....1..1..2..0....1..3..0..1
CROSSREFS
Sequence in context: A300577 A304643 A153848 * A007593 A219104 A219983
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 25 2013
STATUS
approved

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Last modified July 14 13:09 EDT 2024. Contains 374318 sequences. (Running on oeis4.)