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A147106
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
0
1, 1, 1, 1, 3, 7, 15, 37, 181, 733, 3563, 18321, 120179, 876663, 8507491, 85942209, 1181855975
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.1.1.1.0
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.1.1.1.0.0.0.1
.1.0.0.0.1.1.1.0
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.1.1.1.0.0.0.1
CROSSREFS
Sequence in context: A317881 A018020 A192472 * A078161 A216616 A230958
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved