|
|
A221338
|
|
Number of nX2 arrays of occupancy after each element moves to some king-move neighbor, with no 2-loops and with no occupancy greater than 2
|
|
1
|
|
|
0, 13, 85, 758, 5736, 44186, 335511, 2551999, 19387680, 147314684, 1119227588, 8503470301, 64605367209, 490840923878, 3729168338072, 28332370303954, 215255161696051, 1635400433430595, 12424947349080184, 94398470191658900
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 17*a(n-1) -96*a(n-2) +174*a(n-3) +255*a(n-4) -1452*a(n-5) +1878*a(n-6) +67*a(n-7) -2335*a(n-8) +1974*a(n-9) -508*a(n-10)
|
|
EXAMPLE
|
Some solutions for n=3
..0..1....0..1....0..0....0..1....2..1....0..0....1..0....1..1....0..1....0..2
..2..1....2..1....1..2....1..2....2..1....2..2....2..1....2..1....2..0....1..2
..2..0....1..1....1..2....2..0....0..0....2..0....1..1....0..1....1..2....0..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|