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A147161
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 25, 109, 547, 2673, 15771, 134989, 1264235
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.0.0.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.1.0.0.1.1.0.0
.0.0.1.1.0.0.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.1.0.0.1.1.0.0
CROSSREFS
Sequence in context: A272249 A275903 A273828 * A282077 A282085 A290920
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved