|
|
A224372
|
|
Number of nX6 0..2 arrays with rows unimodal and antidiagonals nondecreasing
|
|
1
|
|
|
148, 4690, 80819, 1092281, 13831334, 174854516, 2231009824, 28645726612, 368818252942, 4752723627808, 61255849072312, 789494767364269, 10175118017926314, 131136401564099516, 1690070260377561269
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 28*a(n-1) -283*a(n-2) +1386*a(n-3) -3562*a(n-4) +4940*a(n-5) -3840*a(n-6) -14256*a(n-7) +50007*a(n-8) -26386*a(n-9) +141154*a(n-10) +250789*a(n-11) +41356*a(n-12) +274344*a(n-13) +134400*a(n-14) for n>18
|
|
EXAMPLE
|
Some solutions for n=3
..0..0..0..1..2..1....0..1..1..1..1..1....0..0..0..0..1..2....0..2..0..0..0..0
..2..2..2..2..1..0....2..1..1..1..1..1....1..1..1..2..2..1....2..1..1..0..0..0
..2..2..2..2..2..2....1..1..2..2..1..1....1..1..2..2..2..2....1..1..0..0..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|