|
|
A207732
|
|
Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically
|
|
1
|
|
|
14, 196, 490, 1225, 8575, 60025, 211680, 746496, 4078944, 22287841, 90968949, 371294361, 1833291198, 9052000164, 39384126042, 171355430401, 810254854919, 3831293402161, 17143608557024, 76711252182016, 355989323916384
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = a(n-1) +21*a(n-3) +285*a(n-4) +40*a(n-5) +116*a(n-6) -1248*a(n-7) -17520*a(n-8) -5440*a(n-9) +3712*a(n-10) +13824*a(n-11) +291840*a(n-12) +102400*a(n-13) +131072*a(n-15) -1048576*a(n-16)
|
|
EXAMPLE
|
Some solutions for n=4
..0..1..1..1....1..0..1..1....1..1..1..0....0..0..1..1....0..1..1..1
..1..0..1..1....0..1..1..1....1..1..0..1....1..0..1..1....1..0..1..1
..0..0..1..1....0..0..1..1....1..1..0..0....0..0..1..1....0..0..1..1
..0..0..1..1....0..0..1..1....1..1..1..0....0..0..1..1....0..1..1..1
..1..0..0..1....0..1..1..1....1..0..0..1....0..0..1..1....1..0..0..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|