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A147144
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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 17, 17, 39, 39, 127, 127, 681, 681, 3913, 3913, 21369, 21369, 147701, 147701, 1344439, 1344439, 15252227
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.0.1.1.0.1.1.0.0
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.1.0.1.0.0.0
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CROSSREFS
| Sequence in context: A147190 A146450 A174583 * A152113 A146149 A070925
Adjacent sequences: A147141 A147142 A147143 * A147145 A147146 A147147
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Nov 04 2008
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