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A146449
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0110-0011 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 37, 103, 247, 705, 2637, 10751, 47763, 249479, 1432497, 8448903, 55396711, 408864319, 3345198367, 30485497915, 317358146063, 3656304314307, 46486480051999, 650411725511243
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.0.0.0.1.1.0.1
.0.0.0.1.1.0.1.1
.0.0.1.0.0.1.1.0
.0.1.1.0.0.1.0.0
.1.1.0.1.1.0.0.0
.1.0.1.1.0.0.0.0
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A186721 A177945 A147448 * A145956 A155225 A051842
KEYWORD
nonn
AUTHOR
STATUS
approved