|
|
A146728
|
|
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.
|
|
0
|
|
|
1, 1, 1, 1, 1, 3, 13, 31, 59, 133, 487, 1853, 8419, 38423, 183353, 1033531, 6717069, 50468649, 417543651, 3765006993, 38269269195, 435116516817
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,6
|
|
LINKS
|
|
|
EXAMPLE
|
Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.1.1.0.1.0.0
.1.1.0.0.0.0.1.0
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.1.0.0.0.0.1.1
.0.0.1.0.1.1.0.0
.0.0.1.1.1.0.0.0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|