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A147263
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111-0001 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, 105, 105, 825, 825, 13503, 13503, 390699, 390699, 9339771, 9339771
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.1.0.0.0.0.0.0.0.1
.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
.0.0.0.0.0.0.0.0.0
.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
.1.0.0.0.0.0.0.0.1
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CROSSREFS
| Sequence in context: A147125 A147109 A147117 * A146234 A146182 A147149
Adjacent sequences: A147260 A147261 A147262 * A147264 A147265 A147266
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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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