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A146679
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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 8, 3, 27, 9, 93, 19, 312, 52, 1325, 193, 7552, 866, 50022, 4709, 393372, 29160
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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EXAMPLE
| Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0.0
.1.1.0.0.1.0.0.1.1
.0.1.1.1.0.1.1.1.0
.1.1.0.0.1.0.0.1.1
.0.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.0.1.0.0.0
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CROSSREFS
| Sequence in context: A147373 A147441 A146269 * A146221 A147457 A107061
Adjacent sequences: A146676 A146677 A146678 * A146680 A146681 A146682
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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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