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A146740
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 25, 25, 197, 197, 1317, 1317, 27967, 27967, 769895, 769895, 31824755, 31824755, 2225324253, 2225324253
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
.0.1.1.1.0.1.1.1.0
.1.1.1.1.0.1.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.1.1.1.1
.0.1.1.1.0.1.1.1.0
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A147491 A147507 A146865 * A146724 A165846 A135218
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved