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A147015
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11111-00010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 29, 49, 193, 509, 1945, 5173, 19089, 57135, 304805, 1236463, 7710953, 34938029, 239632727, 1249524805, 10579289505, 68493745825
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.1.0.0.0.1.0
.0.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.1.1.0
.0.1.0.0.0.1.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.1.0.0.0.0.0
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CROSSREFS
| Sequence in context: A023218 A073022 A129694 * A147023 A108402 A090795
Adjacent sequences: A147012 A147013 A147014 * A147016 A147017 A147018
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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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