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A146620
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 1, 13, 13, 77, 73, 597, 385, 9569, 4155, 164139, 53517, 3530729, 1280671, 136089779, 42489917, 6885316541, 1853052759, 545054905807, 122748998951, 61234243905707
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.1.0.0.1.0.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.0.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.0
CROSSREFS
Sequence in context: A147004 A319664 A205961 * A300291 A366159 A174504
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved