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A147168
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 13, 37, 67, 147, 499, 1519, 5231, 22885, 101333, 548323, 3012179, 18194005, 121163279, 875290875
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.1.1.1
.1.0.0.0.1.1.0.1
.1.1.0.0.1.0.0.0
.0.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.0
.0.0.0.1.0.0.1.1
.1.0.1.1.0.0.0.1
.1.1.1.0.0.0.1.1
CROSSREFS
Sequence in context: A113115 A107136 A153009 * A147183 A254955 A098547
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved