|
| |
|
|
A199826
|
|
Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero
|
|
1
|
|
|
|
10, 40, 114, 426, 1650, 6126, 23206, 88636, 337866, 1295566, 4992364, 19269156, 74529210, 288954786, 1122363984, 4366362420, 17011617426, 66365823648, 259213619826, 1013542247970, 3966939195402, 15540399135516, 60929935280508
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
|
|
|
LINKS
|
|
|
|
EXAMPLE
|
Some solutions for n=3
..0....0...-1....0...-1....1...-1...-1....1....1...-1...-2....0...-2....1....1
..1...-1...-2...-2....2....2....0...-2....0....2...-2....1....2...-2....1...-2
.-2...-1....0....0....0....1...-1....1....1....0....1....0...-1....1....0...-1
..1....2....2....2....1...-2....2....1...-2...-1....2....2...-1....2...-2....2
..0....0....1....0...-2...-2....0....1....0...-2....0...-1....0....1....0....0
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
