|
| |
|
|
A200448
|
|
Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences
|
|
1
|
|
|
|
10, 44, 144, 486, 1582, 5478, 18692, 64782, 223272, 776430, 2701660, 9439702, 33021250, 115801892, 406698282, 1430840312, 5040451088, 17779563894, 62784860258, 221948186878, 785340477204, 2781302241584, 9857972484436
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
|
|
|
LINKS
|
|
|
|
EXAMPLE
|
Some solutions for n=3
.-1...-1...-2....1...-1....2....2...-2....2....2....1....1....1...-2...-2....0
..2....1....1....0....1...-1...-1....2...-2...-1...-2...-2...-1....1....1....1
.-1...-2....2...-2....2....1....0....0....0...-2....1....2....0....2...-1...-1
..2....2....0....2...-2....0...-2...-1...-1....0....2...-1....2...-1....2....1
.-2....0...-1...-1....0...-2....1....1....1....1...-2....0...-2....0....0...-1
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
