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A145966
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a one by five or five by one block.
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0
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1, 1, 1, 1, 9, 1, 16, 1, 49, 1, 384, 25, 3677, 173, 58365, 1794, 1326578, 20685, 34318014, 319727, 1264197446, 6676539, 64169954075, 232552310
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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EXAMPLE
| Maximal 9 X 9 example
.0.0.1.1.1.1.1.0.0
.0.0.0.0.0.0.0.0.0
.1.0.1.0.1.0.1.0.1
.1.0.1.0.1.0.1.0.1
.1.0.1.0.1.0.1.0.1
.1.0.1.0.1.0.1.0.1
.1.0.1.0.1.0.1.0.1
.0.0.0.0.0.0.0.0.0
.0.0.1.1.1.1.1.0.0
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CROSSREFS
| Sequence in context: A062357 A061215 A072448 * A014721 A054018 A010170
Adjacent sequences: A145963 A145964 A145965 * A145967 A145968 A145969
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Oct 25 2008
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