|
|
A146680
|
|
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
|
|
0
|
|
|
1, 1, 1, 1, 1, 1, 1, 9, 20, 33, 56, 137, 404, 1209, 4087, 15733, 60343, 254309, 1153606, 5642466, 31006709, 182836767, 1183007758, 8378875432, 64857203324
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,8
|
|
LINKS
|
|
|
EXAMPLE
|
Maximal 8 X 8 example
.0.0.0.0.1.0.1.0
.1.1.0.0.1.1.1.0
.0.1.1.1.0.1.0.0
.1.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.1
.0.0.1.0.1.1.1.0
.0.1.1.1.0.0.1.1
.0.1.0.1.0.0.0.0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|