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A147214
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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 1100-0111-0011 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 23, 23, 55, 55, 315, 315, 2117, 2117, 14227
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,11
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EXAMPLE
| Maximal 11 X 11 example
.0.0.1.1.0.0.0.1.1.0.0
.0.0.1.1.0.0.0.1.1.0.0
.1.1.0.1.1.0.1.1.0.1.1
.1.1.1.0.1.0.1.0.1.1.1
.0.0.1.1.0.0.0.1.1.0.0
.0.0.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.0.0.1.1.0.0
.1.1.1.0.1.0.1.0.1.1.1
.1.1.0.1.1.0.1.1.0.1.1
.0.0.1.1.0.0.0.1.1.0.0
.0.0.1.1.0.0.0.1.1.0.0
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CROSSREFS
| Sequence in context: A146695 A146442 A147128 * A146820 A146663 A146394
Adjacent sequences: A147211 A147212 A147213 * A147215 A147216 A147217
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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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