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A146646
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 7, 13, 27, 41, 115, 303, 1555, 4709, 23865, 76741, 449473, 1923409, 15857735, 84725491
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.0.0.0.0.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.1.0.1.0
.1.1.1.0.0.0.1.1.0
.0.1.0.0.0.0.0.1.0
.0.1.1.0.0.0.1.1.1
.0.1.0.1.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.0.0.0.0.1.0.0.0
CROSSREFS
Sequence in context: A067870 A147258 A146718 * A096194 A160889 A360357
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved