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Search: id:A146740
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| A146740 |
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-1111 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 25, 25, 197, 197, 1317, 1317, 27967, 27967, 769895, 769895, 31824755, 31824755, 2225324253, 2225324253
(list; graph; listen)
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OFFSET
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1,9
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EXAMPLE
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Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.0.1.1.1.0.1.1.1.0
.1.1.1.1.0.1.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.1.1.1.1
.0.1.1.1.0.1.1.1.0
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
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CROSSREFS
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Sequence in context: A147491 A147507 A146865 this_sequence A146724 A165846 A135218
Adjacent sequences: A146737 A146738 A146739 this_sequence A146741 A146742 A146743
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Nov 04 2008
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