|
|
A233158
|
|
Number of 5Xn 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally or antidiagonally
|
|
1
|
|
|
243, 1536, 15552, 157464, 1658232, 17587584, 187446312, 2000708640, 21367730664, 228251103552, 2438324338248, 26048163809952, 278268995799144, 2972714012485056, 31757156984626632, 339258043287199008
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 16*a(n-1) -64*a(n-2) +76*a(n-3) +17*a(n-4) -84*a(n-5) +48*a(n-6) -8*a(n-7) for n>11
|
|
EXAMPLE
|
Some solutions for n=4
..1..2..2..1....1..2..2..1....0..1..2..1....1..0..1..0....1..2..1..2
..2..1..2..1....2..1..2..1....2..1..0..1....0..0..1..2....2..2..2..2
..0..1..2..2....0..1..2..2....0..1..2..2....1..0..1..2....2..2..2..2
..2..1..2..2....2..2..2..1....2..1..2..1....1..2..2..2....2..2..2..1
..2..1..2..1....1..2..2..2....0..1..2..2....1..2..2..2....1..2..2..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|