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A221550
Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns
0
4, 503, 48018, 4107189, 354544219, 30591390580, 2639211238177, 227683834800188
OFFSET
1,1
COMMENTS
Column 4 of A221551
EXAMPLE
Some solutions for n=3
..1..0..2..2....0..2..0..2....1..2..0..0....2..2..1..0....2..2..0..1
..2..1..2..0....1..2..2..2....1..3..0..1....1..0..1..0....0..0..1..1
..0..0..1..1....0..0..1..0....1..1..2..0....1..2..1..1....1..3..1..0
CROSSREFS
Sequence in context: A210310 A324155 A350968 * A022919 A253904 A268468
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 19 2013
STATUS
approved