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A221403
Number of 4 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2.
0
0, 38, 144, 89173, 2294372, 247200529, 10874636860, 776880319370, 41186123651894, 2584866896797503, 146335664855961366
OFFSET
1,2
COMMENTS
Row 4 of A221400.
EXAMPLE
Some solutions for n=3
..0..2..0....0..2..0....0..2..0....0..2..0....0..2..0....0..2..0....1..2..1
..2..2..1....2..2..0....2..2..0....1..2..2....1..2..0....0..2..2....1..2..0
..0..2..0....0..2..2....1..2..0....0..2..0....1..2..1....0..2..2....0..2..0
..0..2..1....0..2..0....0..2..1....1..2..0....1..2..0....0..2..0....0..2..1
CROSSREFS
Sequence in context: A158525 A044370 A044751 * A320309 A164093 A158064
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 15 2013
STATUS
approved