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A147028
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Number of n X n binary arrays symmetric under horizontal 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, 177, 345, 2505, 5729, 75825, 187849, 6215801, 19558129, 3054260057, 12287993577, 1988214768097, 9763619895845, 2194779047865427, 13072631855408245
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.1.0.0.0.0.0.1.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0.0
.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
.0.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.1.0.0.0.0.0.1.0
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CROSSREFS
| Sequence in context: A077786 A188537 A169641 * A105988 A083620 A097317
Adjacent sequences: A147025 A147026 A147027 * A147029 A147030 A147031
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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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