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A146665
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.
0
1, 1, 1, 1, 5, 25, 67, 401, 2363, 17629, 144263, 1829205, 25576287, 554261927, 12075864101
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.0.0.1.1
.1.1.1.0.1.1.1.0
.1.0.0.0.1.0.0.1
.0.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.0
.1.0.0.1.0.0.0.1
.0.1.1.1.0.1.1.1
.1.1.0.0.1.1.0.0
CROSSREFS
Sequence in context: A088959 A018782 A340388 * A322594 A059302 A147130
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved