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A146724
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 25, 25, 197, 197, 1531, 1531, 31791, 31791, 876801, 876801, 39890653, 39890653, 2918403939, 2918403939
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.1.0.1.1.0.1.1.0.1
.1.1.1.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.1.1.1
.1.0.1.1.0.1.1.0.1
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
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CROSSREFS
| Sequence in context: A147507 A146865 A146740 * A165846 A135218 A133507
Adjacent sequences: A146721 A146722 A146723 * A146725 A146726 A146727
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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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