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Search: id:A147225
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| A147225 |
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11011-01110 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 5, 1, 10, 1, 26, 1, 220, 25, 1696, 141, 21805, 844, 438996, 11391, 9601298, 152742, 309244701, 3160409, 15392335628, 110025582, 1035900361260
(list; graph; listen)
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OFFSET
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1,5
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EXAMPLE
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Maximal 9 X 9 example
.0.0.0.1.1.1.0.0.0
.0.0.1.1.0.1.1.0.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.1.0.0.0.0.0.0.0.1
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.1.1.1.0.0.0
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CROSSREFS
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Sequence in context: A040029 A105086 A147362 this_sequence A147061 A147386 A145759
Adjacent sequences: A147222 A147223 A147224 this_sequence A147226 A147227 A147228
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Nov 04 2008
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