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A147029
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 81, 81, 593, 593, 11281, 11281, 273235, 273235, 6759617, 6759617
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0
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CROSSREFS
| Sequence in context: A146604 A147172 A146825 * A146258 A146173 A146190
Adjacent sequences: A147026 A147027 A147028 * A147030 A147031 A147032
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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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