|
| |
|
|
A200186
|
|
Number of -2..2 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, 4, 6, 14, 24, 54, 104, 230, 464, 1028, 2128, 4720, 9918, 22038, 46760, 104056, 222338, 495358, 1064138, 2373070, 5119796, 11425974, 24738074, 55242788, 119958510, 268018844, 583462384, 1304179214, 2845288284, 6362293924
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
COMMENTS
|
|
|
|
LINKS
|
|
|
|
EXAMPLE
|
Some solutions for n=5
.-2....0...-2....0...-1....2....2...-2...-1...-1...-2....1....1....2...-1....0
..1....2....2...-2....2...-2...-2....2....2....1....2...-1...-2...-1....2....2
.-1...-2...-1....2...-1....2....0...-2...-1...-1....0....2....1....1...-2...-1
..2....1....2...-2....1...-2...-2....2....2....2....2...-2...-1...-2....2....1
..0...-1...-1....2...-1....0....2....0...-2...-1...-2....0....1....0...-1...-2
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
