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A146673
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0110 pattern in any orientation.
0
1, 1, 1, 1, 1, 17, 51, 293, 1459, 7621, 56935, 702993, 8365419, 152139369, 2979251133
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.1.0.0.1.1.1.0
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.0.1.1.1.0.0.1.0
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A214660 A258598 A223906 * A330390 A078757 A041560
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved