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A147265
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 47, 157, 479, 1191, 4193, 22021, 114523, 544473, 2865365, 19090211, 131534115
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.0.0.0.0.1.0.0
.0.0.0.0.1.1.1.0.0
.0.0.0.1.1.0.0.1.1
.0.0.1.0.1.0.0.1.0
.0.1.1.1.0.1.1.1.0
.0.1.0.0.1.0.1.0.0
.1.1.0.0.1.1.0.0.0
.0.0.1.1.1.0.0.0.0
.0.0.1.0.0.0.0.0.0
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CROSSREFS
| Sequence in context: A146260 A147166 A146192 * A147272 A147427 A147408
Adjacent sequences: A147262 A147263 A147264 * A147266 A147267 A147268
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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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