|
| |
|
|
A200187
|
|
Number of -3..3 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing
|
|
1
|
|
|
|
1, 6, 14, 48, 144, 482, 1534, 5148, 16826, 56918, 188706, 642300, 2149072, 7348408, 24749244, 84919630, 287439908, 988917344, 3360535304, 11586463472, 39498606276, 136421151864, 466287543690, 1612808711870, 5524756100592
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
COMMENTS
|
|
|
|
LINKS
|
|
|
|
EXAMPLE
|
Some solutions for n=5
..3...-2...-1...-2...-1...-2....2...-2....0....2....2...-1...-3....3....0....2
.-3....3....3....2...-3....2...-2....2...-2...-3...-3....2....2...-3....2...-2
..0...-3...-3....0....2...-2....2....0....2....3....1...-1...-3....2...-3....1
.-3....2....3....2...-1....2...-3....3...-2...-2...-2....1....3...-3....3...-3
..3....0...-2...-2....3....0....1...-3....2....0....2...-1....1....1...-2....2
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
