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Search: id:A147284
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| A147284 |
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 221, 439, 5873, 13627, 205453
(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
.0.1.1.1.0.1.1.1.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.1.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0.0
.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
.1.1.0.0.0.0.0.1.1
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CROSSREFS
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Sequence in context: A159565 A048931 A052478 this_sequence A157490 A020247 A011816
Adjacent sequences: A147281 A147282 A147283 this_sequence A147285 A147286 A147287
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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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