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A147440
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-1010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 4, 7, 14, 21, 42, 83, 288, 707
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.1.0.1.0.1.0.0.0
.1.1.1.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.1.1.1
.0.0.0.1.0.1.0.1.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.1.0.0.0
CROSSREFS
Sequence in context: A147478 A147372 A201272 * A146678 A146417 A008370
KEYWORD
nonn
AUTHOR
STATUS
approved