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A221927
Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns
1
13, 2197, 201378, 20246283, 2007184132, 199492714651, 19816266524892, 1968651817039048, 195572208446932549, 19428830291892380296, 1930127245301117267451, 191745542191155118363255
OFFSET
1,1
COMMENTS
Column 4 of A221929
LINKS
EXAMPLE
Some solutions for n=3
..0..3..1..3....0..1..4..0....0..1..0..2....0..0..1..0....0..2..2..0
..0..0..0..0....0..2..0..0....3..3..0..0....0..2..3..0....0..0..1..1
..2..0..2..1....0..4..0..1....0..0..2..1....3..0..2..1....0..3..2..1
CROSSREFS
Sequence in context: A075601 A325216 A161588 * A013718 A145187 A221896
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 01 2013
STATUS
approved