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A147166
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 47, 123, 369, 1165, 4187, 18445, 79415, 399577, 2091817, 12535539, 80500731
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.0.1.0.0
.0.0.0.1.0.1.1.0.0
.0.0.0.1.1.1.0.1.1
.0.1.1.0.0.0.1.1.0
.0.0.1.0.0.0.1.0.0
.0.1.1.0.0.0.1.1.0
.1.1.0.1.1.1.0.0.0
.0.0.1.1.0.1.0.0.0
.0.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A146175 A146851 A146260 * A146192 A147265 A272705
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved