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A147031
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal 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, 5, 13, 25, 43, 89, 283, 1197, 5015, 19569, 70793, 320835, 1805563, 12416113, 87073927
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.0.0.1.0.0.0.0
.0.0.1.1.1.0.0.0.0
.0.1.0.0.1.1.0.0.0
.0.1.0.0.1.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.1.0.0.1.0
.0.0.0.1.1.0.0.1.0
.0.0.0.0.1.1.1.0.0
.0.0.0.0.1.0.0.0.0
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CROSSREFS
| Sequence in context: A146875 A064276 A102724 * A147220 A196069 A147182
Adjacent sequences: A147028 A147029 A147030 * A147032 A147033 A147034
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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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