login
A147208
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0101-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 13, 45, 213, 1089, 4693, 30575, 258653, 2683865, 36188311, 599719485
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.1.1.0.0.1.0.1.0
.1.0.0.0.0.0.1.1
.1.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.1
.1.1.0.0.0.0.0.1
.0.1.0.1.0.0.1.1
.0.1.1.1.0.0.0.0
CROSSREFS
Sequence in context: A254675 A141549 A121964 * A281315 A361622 A010003
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved