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A146857
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 249, 249, 3481, 3481, 80333, 80333, 1943801, 1943801, 59816323, 59816323
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.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
.1.0.1.1.0.1.1.0.1
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A147203 A146777 A147053 * A146668 A146732 A146588
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved