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A146724
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 25, 25, 197, 197, 1531, 1531, 31791, 31791, 876801, 876801, 39890653, 39890653, 2918403939, 2918403939
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.1.0.1.1.0.1.1.0.1
.1.1.1.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.1.1.1
.1.0.1.1.0.1.1.0.1
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A147507 A146865 A146740 * A165846 A135218 A133507
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved