|
|
A243634
|
|
Number of length n+2 0..n arrays with no three unequal elements in a row and new values 0..n introduced in 0..n order.
|
|
2
|
|
|
4, 9, 21, 51, 127, 324, 844, 2243, 6073, 16737, 46905, 133556, 386062, 1132107, 3365627, 10137559, 30920943, 95457178, 298128278, 941574417, 3006040523, 9697677885, 31602993021, 104001763258, 345524136076, 1158570129917
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=6
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....0....1....1....1....1....1....0....1....0....1....1....0....1....0
..1....0....1....0....1....1....1....1....1....0....0....0....1....1....0....1
..1....1....1....0....2....0....2....1....1....1....1....0....0....0....1....1
..2....1....0....0....1....1....2....1....1....0....1....1....0....0....1....1
..2....2....0....0....1....0....1....2....2....0....1....1....2....1....2....1
..2....1....2....1....3....0....1....2....2....2....1....1....2....1....2....0
..2....1....2....0....3....1....1....1....2....0....0....0....1....0....1....0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|