|
|
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
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
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
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|