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A146575
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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 0100-0100-1111 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, 27, 27, 93, 93, 387, 387, 2257, 2257, 17737, 17737
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,11
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EXAMPLE
| Maximal 11 X 11 example
.0.0.0.0.1.0.1.0.0.0.0
.0.0.1.1.1.0.1.1.1.0.0
.0.1.0.0.1.0.1.0.0.1.0
.0.1.0.0.1.0.1.0.0.1.0
.1.1.1.1.0.0.0.1.1.1.1
.0.0.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.0.0.1.1.1.1
.0.1.0.0.1.0.1.0.0.1.0
.0.1.0.0.1.0.1.0.0.1.0
.0.0.1.1.1.0.1.1.1.0.0
.0.0.0.0.1.0.1.0.0.0.0
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CROSSREFS
| Sequence in context: A162436 A146788 A147244 * A100066 A170832 A117783
Adjacent sequences: A146572 A146573 A146574 * A146576 A146577 A146578
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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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