|
|
A145969
|
|
Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 1 X 5 or 5 X 1 block.
|
|
0
|
|
|
1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 6, 1, 15, 3, 43, 8, 140, 27, 656, 89, 3196, 333, 18641, 1310, 125685, 7293, 1010276, 48975, 9527791, 401989
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,7
|
|
LINKS
|
|
|
EXAMPLE
|
Maximal 9 X 9 example:
0 0 0 0 0 0 0 0 0
0 0 1 1 1 1 1 0 0
0 1 0 0 0 0 0 1 0
0 1 0 0 0 0 0 1 0
0 1 0 0 0 0 0 1 0
0 1 0 0 0 0 0 1 0
0 1 0 0 0 0 0 1 0
0 0 1 1 1 1 1 0 0
0 0 0 0 0 0 0 0 0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|