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A147130
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 25, 71, 443, 1859, 9601, 64045, 595391, 5302231, 72852715, 980189123, 19962381129
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.1.1.1.1.0.0.0.1
.0.1.0.0.1.1.1.1
.0.1.0.0.0.0.0.1
.0.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.0
.1.0.0.0.0.0.1.0
.1.1.1.1.0.0.1.0
.1.0.0.0.1.1.1.1
CROSSREFS
Sequence in context: A146665 A322594 A059302 * A154286 A331575 A078234
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved