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Search: id:A147438
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| A147438 |
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-1010 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 18, 9, 122, 25, 908, 89, 6686, 611
(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
.1.1.1.0.1.0.1.1.1
.0.1.0.1.1.1.0.1.0
.1.1.1.0.1.0.1.1.1
.0.1.0.1.1.1.0.1.0
.0.0.0.0.0.0.0.0.0
.0.1.0.1.1.1.0.1.0
.1.1.1.0.1.0.1.1.1
.0.1.0.1.1.1.0.1.0
.1.1.1.0.1.0.1.1.1
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CROSSREFS
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Sequence in context: A070703 A040309 A146676 this_sequence A033965 A146415 A089517
Adjacent sequences: A147435 A147436 A147437 this_sequence A147439 A147440 A147441
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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)
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