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A221128
Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor
0
1, 987, 118472, 16436223, 2152770692, 282454178707, 36946896429843, 4831791752404317, 631836540867287034, 82621661239567004631
OFFSET
1,2
COMMENTS
Row 4 of A221125
EXAMPLE
Some solutions for n=3
..0..1..0....1..2..1....2..1..0....1..1..0....1..2..1....0..2..1....1..2..0
..2..1..0....1..1..0....0..1..1....2..1..0....0..0..1....0..3..1....1..3..1
..3..1..0....2..0..0....3..2..0....3..1..1....3..1..2....0..1..1....0..0..1
..2..2..0....0..4..0....1..1..0....0..0..2....0..1..0....1..1..1....0..1..2
CROSSREFS
Sequence in context: A072316 A222351 A221696 * A045733 A250490 A258552
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 02 2013
STATUS
approved