|
|
A220329
|
|
Equals two maps: number of 2Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 2Xn array
|
|
1
|
|
|
1, 4, 16, 48, 174, 658, 2482, 9229, 33982, 125217, 461351, 1699127, 6252129, 22995280, 84546207, 310785413, 1142206689, 4197260747, 15421867303, 56659522539, 208152496049, 764662949438, 2808941077111, 10318186228202
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=3
..0..1..0....0..0..1....0..0..0....0..0..1....0..1..1....0..1..1....0..1..0
..0..0..0....1..0..0....0..1..0....0..0..0....0..1..0....1..1..0....1..1..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|