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A146853
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 15, 39, 71, 173, 597, 1851, 6753, 30359, 143255, 790071, 4528523, 29159423, 204966875, 1600354339
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.1.1.0.1.0.0
.1.1.1.1.0.1.1.0
.1.0.0.0.0.1.1.0
.0.1.1.0.0.0.0.1
.0.1.1.0.1.1.1.1
.0.0.1.0.1.1.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A353679 A065765 A318738 * A183476 A297621 A014309
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved