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A147145
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Number of n X n binary arrays symmetric 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, 13, 25, 51, 161, 489, 1381, 4593, 16307, 70385
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.1.0.0.0.0.0.0.1.1
.1.1.0.0.0.0.1.1.0
.0.1.1.0.0.1.1.0.0
.0.0.1.1.0.1.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.1.1.0.0
.0.0.1.1.0.0.1.1.0
.0.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.0.0.1
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CROSSREFS
| Sequence in context: A125724 A163551 A005696 * A151776 A116524 A053404
Adjacent sequences: A147142 A147143 A147144 * A147146 A147147 A147148
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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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