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A147286
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 5, 9, 25, 53, 175
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.1.1.1.0
.0.0.0.0.0.1.0.0.1
.0.0.0.0.1.1.0.0.1
.0.0.0.0.1.0.1.1.1
.0.0.1.1.0.1.1.0.0
.1.1.1.0.1.0.0.0.0
.1.0.0.1.1.0.0.0.0
.1.0.0.1.0.0.0.0.0
.0.1.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A147383 A276918 A127976 * A137199 A221567 A147512
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved