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A147160
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 9, 25, 53, 97, 275, 939, 2977, 11455, 54387, 273381, 1565737, 8740687, 56416565, 398132663
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.0.1.1
.1.1.0.0.1.1.1.0
.0.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.0
.0.1.1.1.0.0.1.1
.1.1.0.0.0.0.0.1
CROSSREFS
Sequence in context: A371085 A362971 A348232 * A336669 A239745 A269440
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved