|
|
A237489
|
|
Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
|
|
1
|
|
|
256, 1728, 11960, 84000, 589944, 4135648, 28986208, 203229696, 1425235712, 9994034688, 70063673600, 491213816320, 3444698036992, 24155061404672, 169341502948352, 1187245857484800, 8325697972232192, 58381830568157184
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 2568*a(n-4) -371328*a(n-8) +15212544*a(n-12) -125530112*a(n-16) +93167616*a(n-20) -143392768*a(n-24) for n>27
|
|
EXAMPLE
|
Some solutions for n=4
..0..3....1..0....1..3....3..2....2..2....3..0....2..2....1..0....1..2....0..3
..2..3....3..0....2..2....3..3....2..0....3..0....2..1....0..2....3..1....0..1
..3..1....3..3....3..0....2..2....2..3....2..0....1..2....0..0....2..0....3..1
..3..3....0..2....2..1....2..1....0..1....1..3....2..0....1..0....3..0....2..2
..2..3....1..2....1..3....0..1....2..2....0..1....1..1....2..1....1..2....0..3
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|