|
|
A208423
|
|
Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically
|
|
1
|
|
|
18, 324, 1278, 10098, 55404, 365094, 2187162, 13759164, 84389022, 524422458, 3236767200, 20048681286, 123951850866, 767084787144, 4744724741082, 29355963846786, 181601409572100, 1123505977913586, 6950462612268942
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = a(n-1) +35*a(n-2) +18*a(n-3) -225*a(n-4) -67*a(n-5) +494*a(n-6) +85*a(n-7) -455*a(n-8) -40*a(n-9) +178*a(n-10) +6*a(n-11) -24*a(n-12)
|
|
EXAMPLE
|
Some solutions for n=4
..1..0..1..1....1..0..1..1....0..1..0..1....0..1..1..1....1..0..1..1
..0..1..0..1....0..1..1..0....1..1..1..0....1..1..0..0....0..1..0..0
..1..0..1..0....1..0..1..0....0..1..0..0....0..1..1..1....1..0..1..1
..0..1..0..1....0..1..0..1....1..0..1..1....0..1..0..0....0..1..0..0
..1..0..1..0....1..0..1..0....0..1..0..0....1..0..1..0....1..0..1..1
..0..1..0..1....0..1..0..1....1..0..1..0....0..1..0..1....0..1..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|