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A146572
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Number of n X n binary arrays symmetric under horizontal and vertical reflection 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, 17, 17, 57, 57, 369, 369, 6075, 6075, 152201, 152201, 4520107, 4520107, 199476793, 199476793, 15394540581
(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
.0.0.0.1.0.1.0.0.0
.0.1.1.1.0.1.1.1.0
.0.0.0.1.0.1.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.1.0.0.0
.0.1.1.1.0.1.1.1.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
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CROSSREFS
| Sequence in context: A146692 A146439 A146785 * A147211 A147241 A146580
Adjacent sequences: A146569 A146570 A146571 * A146573 A146574 A146575
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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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