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A147396
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 13, 45, 145, 549, 1997, 9119, 41645
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.0
.0.0.1.0.0.0.0.0
.0.0.1.0.0.0.0.0
.0.0.1.1.1.0.0.0
CROSSREFS
Sequence in context: A322203 A052899 A147200 * A320877 A099972 A060050
KEYWORD
nonn
AUTHOR
STATUS
approved