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A146236
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 9, 17, 33, 89, 333, 849, 5379, 20923, 147329, 704405, 5858399, 36340527, 403495741, 3132269377, 47135996775, 474369570793, 8861603100211, 114644138972971
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.0.1.1.0.0
.0.0.0.1.1.0.1.1
.0.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.0
.1.1.0.1.1.0.0.0
.0.0.1.1.0.0.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A127193 A262453 A197344 * A147279 A173788 A097478
KEYWORD
nonn
AUTHOR
STATUS
approved